Things You Should Know. To call customer service from your Telkom fixed line phone, dial 10210. To call from your mobile Telkom phone, dial 081180. Chat with a representative at https://chat.telkom.co.za, or send a Twitter DM to @TelkomZA. Method 1.Jan 12, 2016 · Can anyone help with setting fixed dial numbers on phone. I am trying to provide my young son with Down Syndrome with his own phone but we need to ensure that he only dials numbers within his family group. Although I have been able to identify the FDN on the sim once switched on I cannot see how to add the fdn numbers. Thank you. AJ Nov 18, 2013 1:25 PM in response to diesel vdub. We are building a "devcie" based on the iPhone that will handle functions required for the business. The devcie should be able to dial only numbers from a specific "fixed" list of numbers, Help desk/Dispatcher/etc. The current information is we can drive this through the SIM …Please follow the prompts under detailed steps to get your PIN unlock key on the article provided above. Unlock your device with our Troubleshoot And Resolve Tool provided, make sure to enter the correct device at Change Device. Keep in mind that that if your device displays PUK2/PUK blocked call operator then the wrong PUK code was …Fixed dialing numbers (FDN)—The FDN EF works similar to the ADN because it involves contact numbers and names. With this function, The user doesn't have to dial numbers; by pressing any number pad of the phone, he can access to the contact number.Dec 2, 2023 · July: Was using a feature called Fixed Dialing Numbers — limiting/specifying numbers that could be called by user. October: Carrier has done something to disable this feature. We have asked to have it turned back on— hours and hours of frustrating run-around calls, work orders, three new sim cards and even a new number. What to know about this communications technology. By Robert Earl Wells III. Published on April 21, 2020. Unstructured Supplementary Service Data (USSD) is a communication protocol for mobile phones. By using USSD codes, you can access web-based services without installing a mobile app. Here's what is it, …Telephone numbers in Russia are administered by Roskomnadzor, and Ministry of Digital Development, Communications and Mass Communications of the Russian Federation. Russia's National Numbering Plan (NNP) is a four-level telephone numbering plan with local, zone, country, and international scopes, implementing a closed numbering plan, …8 Feb 2021 ... Learn how you can turn on fix dialing numbers (FDN) on the Galaxy S21/Ultra/Plus. Gears I use: Velbon Sherpa 200 R/F Tripod With 3 Way ...011 - international prefix; dial first when calling abroad from the US or Canada. 355 - Country Code for Albania. Phone Number ( remove initial 0 ): fixed - 8 digits including area code. cell phones - 9 digits.Jan 5, 2024 · The feature does not allow dialing any other number except for the fixed dialing number. Setting path: To enable the option please follow the below step. Path: Open the Phone app > Tap More options > Settings > Calling accounts > Carrier call setting > Enable FDN > Enter the “PIN Number provided by the Operator” 8 Feb 2021 ... Learn how you can turn on fix dialing numbers (FDN) on the Galaxy S21/Ultra/Plus. Gears I use: Velbon Sherpa 200 R/F Tripod With 3 Way ...Jan 12, 2016 · Can anyone help with setting fixed dial numbers on phone. I am trying to provide my young son with Down Syndrome with his own phone but we need to ensure that he only dials numbers within his family group. Although I have been able to identify the FDN on the sim once switched on I cannot see how to add the fdn numbers. Thank you. AJ Turn fixed dialling on your Samsung Galaxy J3 (2017) Android 7.0 on or off Read help info When fixed dialling is turned on, you can only call selected numbers and do emergency calls.Apr 6, 2020 · Learn how you can turn on Fixed Dialing Numbers (FDN) on Galaxy S20 / S20 Plus / S20 Ultra.Android 10.FOLLOW US ON TWITTER: http://bit.ly/10Glst1LIKE US ON F... Dial the country code for the UK – 44. Dial the UK mobile phone number, omitting the first 0. For example to call a hypothetical person in the UK with a mobile phone number 0712 345 6789; From a UK landline – dial 0712 …Direct inward dialing (DID), also called direct dial-in (DDI) in Europe and Oceania, is a telecommunication service offered by telephone companies to subscribers who operate private branch exchange (PBX) systems. The feature provides service for multiple telephone numbers over one or more analog or digital physical circuits to the PBX, and transmits …16 Jan 2019 ... Learn how you can enable or disable Fixed Dialling Numbers on Samsung Galaxy S9 / S9+. FOLLOW US ON TWITTER: http://bit.ly/10Glst1 LIKE US ...Press Fixed dialling numbers. Step 6 of 10. 2. Turn on fixed dialling. Press Enable FDN to turn on fixed dialling. Step 7 of 10. 2. Turn on fixed dialling. Key in your PIN2 and press OK.Can anyone help with setting fixed dial numbers on phone. I am trying to provide my young son with Down Syndrome with his own phone but we need to ensure that he only dials numbers within his family group. Although I have been able to identify the FDN on the sim once switched on I cannot see how to …Using Fixed Dialing Numbers (FDN) You can set up your device so that it can only dial certain phone numbers. To change FDN settings, you must acquire the FDN PIN for your SIM card from your service provider. 1. From the application tray, touch Settings > Phone > Fixed Dialing Numbers. 2. Touch Enable FDN. 3. Enter the …Step 3: Then, tap on Settings. Step 4: From the Call settings menu, tap on Block numbers. Step 5: From the list of blocked numbers, locate the number you’re trying to call. If you find it, tap ...Dial an in-country number. If you dial a toll number, your carrier rates will apply. You can find the numbers on your meeting invitation or view a full list of international dial-in numbers. You will be prompted to enter the meeting ID - the nine (9), ten (10), or eleven (11) digit ID provided to you by the host, followed by #.Jun 16, 2020 · Here is a more visual comparison: Fixed VoIP Phone Numbers. Non-Fixed VoIP Phone Numbers. Can work through SIP trunking or an internet connection. Need only an internet connection to work. Need to be assigned to a physical address. Does not need to be assigned to a physical address. More authentic and secure. Less secure; However, providers are ... Jan 10, 2024 · What is a Fixed VoIP number? A fixed VoIP phone number is an internet-based line connected to a physical address. It is owned by an account owner and is attached to an actual address and an account owner. For instance, there is a company named XYZ that runs its business operations from Florida, USA and has a telephone number of +1-305-389-7241. Fixed Dialing Number (FDN) is a service mode of a GSM phone's Subscriber Identity Module (SIM) card. Numbers are added to the FDN list, and when activated, FDN restricts outgoing calls to only those numbers listed, or to numbers with certain prefixes. A notable exception is that emergency calls to 000, ...Calling Vietnam explained: 011 - international prefix; dial first when calling abroad from the US or Canada. 84 - Country Code for Vietnam. Phone Number ( remove initial 0) - 9 digits for mobiles and 10 digits for landlines. example call from the United States or from Canada to a landline in Hanoi: 011 84 24 ???? ????How to turn off and on Dial Assist. On your iPhone, tap Settings. Tap Phone. Scroll all the way down, and you will see the Dial Assist switch. As I stated above, by default, this is turned on. You can turn it off or on, depending on your preference. If you disable this feature, then you may need to enter the full phone …Fixed Dialing Number (FDN) is a service mode of a GSM phone's SIM card. Numbers are added to the FDN list, and when activated, FDN restricts outgoing …DID versus Direct Outward Dialing (DOD) Direct Outward Dialing (DOD) is a service that enables outbound calls from a DID number. DOD can complement direct inward dialing service to enable two-way voice communication with a fixed caller identification. In addition, DOD can also facilitate from any of the company’s main phone …IMEI stands for “International Mobile Equipment Identity.”. It’s a unique number for identifying a device on a mobile network. You can think of it as your phone’s social security number ...This lets you set up a phone to only call certain numbers. Before you sign up for another contract, make sure the network operator and phone supports fixed dialling. This way your son can choose a ...When fixed dialling is turned on, you can only call selected numbers and do emergency calls. Incoming calls aren't affected. Google Pixel 5. Android 11.0 ... Find "Fixed dialling numbers" Press the phone icon. Step 2 of 11. 1. Find "Fixed dialling numbers ...The process for dialing a U.S. fax number from another country requires a person to enter the country code, followed by the area code and fax number. Some fax services also require... Fixed Dialing Numbers. Definitions: a set of phone numbers kept on the SIM that the phone can call exclusively of any others (i.e., all other numbers are disallowed). Sources: NISTIR 7250. NISTIR 7387. *By inserting your area code, you will only have to insert the phone number you would like to call when calling a fixed number. *What is my Area code? Example: +49 211 123456 49 = country code 211 = area code for DÜsseldorf 123456 = the phone number you would like to call The area code is the code for your current location. The landline or fixed line telephone system basically consists of two end points and a transmission medium. The endpoints are the telephone sets and the transmission medium the telephone line. In a telephone set (also just called phone) sound waves are converted via a microphone into electric waves, which are transmitted over a pair of twisted ... Famous quotes containing the words fixed, dialing and/or number: “ The foot of the heavenly ladder, which we have got to mount in order to reach the higher regions, has to be fixed firmly in every-day life, so that everybody may be able to climb up it along with us. When people then find that they have got climbed up higher and higher into a …13 Jan 2024 ... fixed dialing number setting kya hai disable fdn pin2 fixed dialing numbers kya hota hai puk2 code unlock fixed dial number only solution ...Jun 8, 2018 · How to unlock FDN PIN2 to Add Contacts to ATT SIM. Hey Everybody, I recently purchased a brand new in box ATT phone that was manufactured by ZTE. It is the Maven3. I noticed the FDN (Fixed Dialing Numbers) setting under call settings, already had a PIN2 lock code. I want to access that to Add FDN #s which can use the small storage on the sim to ... Fixed dialing is a network-based service which should not be active unless you specifically ask them for it, perhaps it has been activated on your account by mistake and another customer is wondering why it doesn`t work for him. You would have to get in touch with your network operator to deal with this. However, it may be possible to activate/deactivate it …When fixed dialling is turned on, you can only call selected numbers and do emergency calls. Incoming calls aren't affected. Google Pixel 5. Android 11.0 ... Find "Fixed dialling numbers" Press the phone icon. Step 2 of 11. 1. Find "Fixed dialling numbers ... Tap Fixed dialling numbers below the required SIM. Tap Enable FDN. Key in your PIN2 and tap OK. The default PIN2 is 0000. Tap Disable FDN. Key in your PIN2 and tap OK. The default PIN2 is 0000. Tap the Home key to return to the home screen. When fixed dialing is turned on, you can only call selected numbers and emergency numbers. Fixed dialing is a network-based service which should not be active unless you specifically ask them for it, perhaps it has been activated on your account by mistake and another customer is wondering why it doesn`t work for him. You would have to get in touch with your network operator to deal with this. However, it may be …30 Aug 2021 ... FDN Kya Hai। What is FDN In Hindi। Fixed dialing numbers kya hai ? #FDN #Fixed_dialing_numbers Friends aap is service ka use karke ye ...A non-fixed VoIP phone number isn’t attached to a physical address. It’s also known as a virtual phone number. Just like fixed VoIP numbers, it can be used as a residential or business phone line as part of a company’s phone system. Since they don’t require a fixed address, non-fixed VoIP numbers can be associated with one or more ...• Dial #21# (dial toneDial #21# (dial tone) ))) • Replace the handset. Caller IDCaller ID TTTTrace the incoming callrace the incoming callrace the incoming call Incoming calls numbers are displayed on CID enabled phones. Call EPABX operatorCall EPABX operator For inquiry/complaints etc dial 7200, 7210, 7200, 7210, 3000 3000The Competition and Markets Authority (CMA) opened a formal probe of Microsoft's acquisition of Activision Microsoft’s $68.7 billion all-cash deal to bag gaming giant Activision Bl...228.5K Messages. 7 years ago. Hello @ waNE57! Great question! I will be happy to help! The PUK code is something that you enter to unlock the SIM card. Check out our support article Enter PUK code for specific instructions on where to find this information and how to use it. Let us know if you have any other questions!This help content & information General Help Center experience. Search. Clear searchCalling Croatia explained: 011 - international prefix; dial first when calling abroad from the US or Canada. 385 - Country Code for Croatia. Phone Number ( remove initial 0 ): fixed - 8 to 9 digits with area code. cell phones - 9 digits.Dec 2, 2023 · July: Was using a feature called Fixed Dialing Numbers — limiting/specifying numbers that could be called by user. October: Carrier has done something to disable this feature. We have asked to have it turned back on— hours and hours of frustrating run-around calls, work orders, three new sim cards and even a new number. Dec 2, 2023. #1. Have a Galaxy12 on our plan. July: Was using a feature called Fixed Dialing Numbers — limiting/specifying numbers that could be called by user. October: Carrier has done something to disable this feature. We have asked to have it turned back on— hours and hours of frustrating run-around calls, work orders, three new sim ...19 Nov 2022 ... Fixed Dialing Number Blocked | Puk2 Code | Fdn Pin Code Problem Solved Redmi & Realme fdn pin what is fdn pin code fixed dialing number ka ...Calling Vietnam explained: 011 - international prefix; dial first when calling abroad from the US or Canada. 84 - Country Code for Vietnam. Phone Number ( remove initial 0) - 9 digits for mobiles and 10 digits for landlines. example call from the United States or from Canada to a landline in Hanoi: 011 84 24 ???? ????Turn off fixed dialling. Key in your PIN2 and press OK. The default PIN2 is 1111. 4. Return to the home screen. Press the Home key to return to the home screen. When fixed dialling is turned on, you can only call selected numbers and do …Step 3: Then, tap on Settings. Step 4: From the Call settings menu, tap on Block numbers. Step 5: From the list of blocked numbers, locate the number you’re trying to call. If you find it, tap ...Fix number dialing active . Community Experts online right now. Ask for FREE. Ask Your Question Fast! ...Fix number dialing active . Community Experts online right now. Ask for FREE. Ask Your Question Fast! ...Are you facing issues with your Florida Power & Light (FPL) service? Don’t worry, help is just a phone call away. By dialing the FPL customer service phone number, you can connect ...Fixed Dialing Number ( FDN) is a service mode of a GSM phone’s Subscriber Identity Module (SIM) card. Numbers are added to the FDN list, and when activated, FDN restricts outgoing calls to only those numbers listed, or to numbers with certain prefixes.Tap Phone. Tap the Menu key. Tap Call settings. Tap Additional settings. Tap Fixed Dialling Numbers. Tap Enable FDN or Disable FDN (depending on the current setting). …Jun 8, 2018 · How to unlock FDN PIN2 to Add Contacts to ATT SIM. Hey Everybody, I recently purchased a brand new in box ATT phone that was manufactured by ZTE. It is the Maven3. I noticed the FDN (Fixed Dialing Numbers) setting under call settings, already had a PIN2 lock code. I want to access that to Add FDN #s which can use the small storage on the sim to ... Types of VoIP Phone Lines. What is Fixed VoIP? While both types of numbers connect your phones through the internet, a fixed phone number requires a … Fixed Dialing Number (FDN) is a service mode of SIM, where outgoing calls are restricted to a set of phone numbers. Related to Fixed Dialing Number (FDN) Location Routing Number (LRN means the ten (10) digit number that is assigned to the network switching elements (Central Office–Host and Remotes as required) for the routing of calls in the ... Specifications. Turn fixed dialling on your Vodafone Smart V10 Android 9.0 on or off. Read help info. When fixed dialling is turned on, you can only call selected numbers and do …When it comes to making international calls, understanding the all country telephone code numbers is essential. These codes are used to dial out of a specific country and connect w...Please follow the prompts under detailed steps to get your PIN unlock key on the article provided above. Unlock your device with our Troubleshoot And Resolve Tool provided, make sure to enter the correct device at Change Device. Keep in mind that that if your device displays PUK2/PUK blocked call operator then the wrong PUK code was … Press Disable FDN to turn off fixed dialling. 3. Turn off fixed dialling. Key in your PIN2 and press OK. The default PIN2 is 1111. 4. Return to the home screen. Press the Home key to return to the home screen. When fixed dialling is turned on, you can only call selected numbers and do emergency calls. You can also set up fixed numbers using your SIM card, so only the numbers that you allow can be dialed. Note: Certain features may not be supported with specific carriers …As a popular ride-hailing service, Lyft provides a convenient way for people to get around town. While the app is user-friendly and efficient, there may be instances when reaching ...Welcome to a two public-offering week. U.S software company Amplitude is expected to post a direct-listing reference price this evening and begin trading tomorrow morning, per publ...Fixed calling services. Fixed calling services . Joini ng the MTN Busi ness network puts your company on one of Africa's most robust and reliable telecoms infrastructures. And having pre-existing office and personal numbers shouldn't stop you. You can simply port geographic numbe rs to our network or have new numbers allocated.Using Fixed Dialing Numbers (FDN) You can set up your device so that it can only dial certain phone numbers. To change FDN settings, you must acquire the FDN PIN for your SIM card from your service provider. 1. From the application tray, touch Settings > Phone > Fixed Dialing Numbers. 2. Touch Enable FDN. 3. Enter the …27 Feb 2023 ... Learn how you can manage Fix Dialing Number (FDN) phone number list for outgoing call restrictions on the Samsung Galaxy S23/S23+/Ultra.011 - international prefix; dial first when calling abroad from the US or Canada. 27 - Country Code for South Africa. Phone Number ( remove initial 0) - 9 digits, area code included for fixed lines. example call from the United States or from Canada to a landline in Cape Town: 011 27 21 ??? ????Can anyone help with setting fixed dial numbers on phone. I am trying to provide my young son with Down Syndrome with his own phone but we need to ensure that he only dials numbers within his family group. Although I have been able to identify the FDN on the sim once switched on I cannot see how to …It is common to get an IVR reply saying 'The number you have dialed is no longer in service' when dialing a number. Regardless, of the device or service The number you have dialed is no longer in serviceIt is common to get an IVR reply saying 'The number you have dialed is no longer in service' when dialing a number.Taipei: Taipei City, New Taipei City, Keelung City: 8: Numbers that start with 2,3 and 8 are assigned to Chunghwa Telecom (ILEC-the main operator), Number ranges that start with 4, 5, 6 and 7 are competitive fixed network operators, such as Taiwan Fixed Network (TFN), New Century InfoComm LTD (NCIC), and Asia Pacific Telecom (APT), as Chunghwa …In today’s fast-paced world, staying connected is more important than ever. Whether it’s for work or personal use, having a reliable internet and phone service is crucial. When exp...Fixed Dialing Number (FDN) is a service mode of a GSM phone's Subscriber Identity Module (SIM) card. Numbers are added to the FDN list, and when activated, FDN restricts outgoing calls to only those numbers listed, or to numbers with certain prefixes. A notable exception is that emergency calls to 000, ...Dec 2, 2023 · July: Was using a feature called Fixed Dialing Numbers — limiting/specifying numbers that could be called by user. October: Carrier has done something to disable this feature. We have asked to have it turned back on— hours and hours of frustrating run-around calls, work orders, three new sim cards and even a new number. Types of VoIP Phone Lines. What is Fixed VoIP? While both types of numbers connect your phones through the internet, a fixed phone number requires a …Fixed Dialing Number (FDN) is a service mode of SIM, where outgoing calls are restricted to a set of phone numbers. Related to Fixed Dialing Number (FDN) Location Routing Number (LRN means the ten (10) digit number that is assigned to the network switching elements (Central Office–Host and Remotes as required) …Is your to-do list messing with your productivity? Try Charles Duhigg's 3-step process for creating better lists. Trusted by business builders worldwide, the HubSpot Blogs are your...Good morning, Quartz readers! Good morning, Quartz readers! The UN Security Council holds a meeting on North Korea. Ja Song Nam, North Korea’s ambassador to the UN, will be at toda...Toll-free telephone number. A toll-free telephone number or freephone number is a telephone number that is billed for all arriving calls. For the calling party, a call to a toll-free number from a landline is free of charge. A toll-free number is identified by a dialing prefix similar to an area code.Kimbotwin. I found one at Consumer Cellular. It is one that has “FDN” capacity. Fixed dialing numbers. I called several AT&T stores and none of them knew what is was. The folks at consumer cellular were similarly confused until I read the definition to them of “FDN”... a supervisor was able to find one for me.Calling Vietnam explained: 011 - international prefix; dial first when calling abroad from the US or Canada. 84 - Country Code for Vietnam. Phone Number ( remove initial 0) - 9 digits for mobiles and 10 digits for landlines. example call from the United States or from Canada to a landline in Hanoi: 011 84 24 ???? ???? A landline number is a fixed phone number connected with physical wires. It differs from a cell phone number in many ways. For instance, while cell phones use radio waves to transfer a voice call, landlines use a wire or cable on a fixed line. That’s why a landline phone is sometimes referred to as a “hard wired” phone line. Current time in Finland: 12:23 AM, March 25, 2024 Calling Finland explained: 011 - international prefix; dial first when calling abroad from the US or Canada; 358 - Country Code for Finland; Phone Number (remove initial 0): . fixed - …
How to Make an International Call from the USA or Canada. For calls to most countries, dial the following: 011 + country code + phone number. For calls to countries within the North American Numbering Plan dial 1 + area code + 7 digit local number, same as dialing a US state-to-state call (note that you will incur international charges). Van gogh museum gallery
Ringback numbers are not available publicly but can be accessed by calling your phone provider and requesting the ringback number for your area. Another option would be to call you...Telephone counselling for children (Rat auf Draht) 15xx. General information services (time etc.) 0718. Internet dial-up numbers. 0720. Location independent landline numbers. 0780. Convergent services with ENUM ( VoIP )26 May 2018 ... Fixed Dialing Numbers or FDN option is an amazing secret Android setting. This hidden setting of Android is very useful to all. Press Disable FDN to turn off fixed dialling. 3. Turn off fixed dialling. Key in your PIN2 and press OK. The default PIN2 is 1111. 4. Return to the home screen. Press the Home key to return to the home screen. When fixed dialling is turned on, you can only call selected numbers and do emergency calls. Fixed Dialing Number (FDN) is a service mode of SIM, where outgoing calls are restricted to a set of phone numbers. Related to Fixed Dialing Number (FDN) Location Routing Number (LRN means the ten (10) digit number that is assigned to the network switching elements (Central Office–Host and Remotes as required) for the routing of calls in the ... Xiaomi. How to Set up Fixed Dialing Numbers. Xiaomi Jun 09, 2021 2600. More like this? Subscribe. We can restrict and specify which phone numbers or …Fix number dialing active . Community Experts online right now. Ask for FREE. Ask Your Question Fast! ...Learn how you can turn on Fixed Dialing Numbers (FDN) on Galaxy S20 / S20 Plus / S20 Ultra.Android 10.FOLLOW US ON TWITTER: http://bit.ly/10Glst1LIKE US ON F...Simply dial the short code to get the information you need. Non-T-Mobile self-service short codes are not supported on select plans. Codes 401, 403, 405, 409, 440, ... This doesn't restrict your information when you dial certain business numbers, including 911, 900 numbers, or toll-free numbers.Fixed Dialing Number and PIN2. Aug 23, 2014 20:53. 0. 6. 4.9k. I was trying to enable Fixed Dialing Numbers "FDN" and it asks for my PIN2. I do not know what mine is. Is it tied to the phone or to the SIM card? I called T-Mobile and they said they do not have it and it should be tied to the phone.List view. Tap the phone icon. Tap the menu icon. Tap Settings. Tap Calls. Tap Fixed dialling numbers. Tap Enable FDN to turn on fixed dialing. 0000. Key in your PIN2 and …Tap Phone. Tap the Menu key. Tap Call settings. Tap Additional settings. Tap Fixed Dialling Numbers. Tap Enable FDN or Disable FDN (depending on the current setting). …As technology continues to advance, there are countless ways to get around town. However, when it comes to fast and reliable transportation, sometimes the old-fashioned way is stil...This help content & information General Help Center experience. Search. Clear searchFDN abbreviation stands for Fixed Dialing Numbers. Suggest. FDN means Fixed Dialing Numbers. Abbreviation is mostly used in categories: Technology Dialing Calling Card. Rating: 1. 3 votes. What does FDN mean? FDN stands for Fixed Dialing Numbers (also Foundation and 73 more) Rating: 2 ...Check whether the fixed dialing service has been enabled. After Fixed Dialing Numbers is enabled, you can only send messages to contacts in the Fixed Dialing Numbers list. Disable the Fixed Dialing Numbers service and try sending the message again. You can go to Phone > ⋮ > Settings > SIM > More > Fixed Dialing Numbers, and disable Fixed ...Taipei: Taipei City, New Taipei City, Keelung City: 8: Numbers that start with 2,3 and 8 are assigned to Chunghwa Telecom (ILEC-the main operator), Number ranges that start with 4, 5, 6 and 7 are competitive fixed network operators, such as Taiwan Fixed Network (TFN), New Century InfoComm LTD (NCIC), and Asia Pacific Telecom (APT), as Chunghwa …This help content & information General Help Center experience. Search. Clear searchFixed Dialing Number (FDN) is a service mode of the Subscriber Identity Module (SIM) card of a GSM phone. Numbers are added to the FDN list, and when activated, FDN restricts outgoing calls to only the numbers listed. What is FDN fixed dialing? Let’s start with the basics..