Don't know how to unlock my mobile device to all networks

If you bought your device from Telekom (T-Mobil), you can try unlocking it through Telekom's website. In order to do so, follow these steps:

1. Open the IMEI submission form on Telekom's website.
   
   
2. Enter your phone's IMEI in a cell and click the Daten prüfen button.
   * In order to find your device's IMEI, type *#06# in the caller menu (as if you are to call somebody).
   
   

   

   
   
   
3. Then you will receive a code via the email address you will be provided with, which you should use when you click on Bestätigungscode. in order to check if your device has been unlocked.
   
   

   

If you bought your device from Vodafone, you can try unlocking it through Vodafone's website. In order to do so, follow these steps:

1. Open the IMEI submission form on Vodafone's website.
   
   
2. Enter your phone's IMEI in a cell and click the Absenden button.
   * In order to find your device's IMEI, type *#06# in the caller menu (as if you are to call somebody).
   
   

   

   
   
   
3. Wait for Vodafone's reply and follow their instructions.

Note: On some devices you can find the IMEI number in Settings.

Maybe your device is not locked to an operator, but experiences issues with the SIM card slot. If it is locked to an operator, you should get a notification, which will inform you that your device is locked when you insert a SIM card. However, if you get an "Insert SIM card" notification, it is possible that the SIM card slot is not working, i.e. your SIM card is not recognized at all.

Check out the device doesn't recognize SIM card guide to learn how to fix this issue.

The operators sell some of their mobile devices locked only to their network. So, if your device is able to recognize only the SIM card from the operator you bought your device from and not from other operators, your device is definitely locked to an operator (carrier).

In this case, go to the store you bought your device from and ask them to unlock it for you.

Note: Write the IMEI number when you go to the operator's store, in order to help them find your device faster.

Every carrier has a support-call number, which you can use to ask the operator's support staff to unlock your mobile device. If you don't know the number, look it up on the payment bill you receive monthly, on their website or on their newsletters.

If you bought your phone from AT&T and you are unable to use it with a SIM card from a different operator, try calling AT&T's support on 1-800-225-5288.

If you didn't manage to call them, click here to visit AT&T's troubleshooting page, where you can contact them online.

If you bought your phone from T-Mobile and you are unable to use it with a SIM card from a different operator, try calling T-Mobile's support on 1-877-453-1304 if you are in the US, or 1-505-998-3793 if you are out of the US, at the moment.

If you didn't manage to call them and if you have access to a computer, visit T-Mobile's troubleshooting page, where you can contact their support, too.

If you bought your phone from Sprint and you are unable to use it with a SIM card from a different operator, try calling Sprint's support. You can reach them on +1 888-211-4727.

If you didn't manage to call them, check out Sprint's troubleshooting page, where you can also contact them from.

If you bought your phone from Centurylink and you are unable to use it with a SIM card from a different operator, try calling Centurylink's support team on +1 877-837-5738.

If you didn't manage to call them, go to their troubleshooting page, which will try to diagnose and fix this issue.

Note: You may be asked to enter your ZIP code.

If you bought your phone from Verizon and you are unable to use it with a SIM card from a different operator, try calling Verizon's support. You can call them on 1-800-922-0204.

If you didn't manage to call them, see their troubleshooting page, and contact them from there.

If you bought your phone from Frontier and you are unable to use it with a SIM card from a different operator, try calling Frontier's support on 1-800-921-8101.

If you didn't manage to reach them on the phone, visit their troubleshooting page.

If you bought your phone from Boost Mobile and you are unable to use it with a SIM card from a different operator, call Boost Mobile's support on +1 866-402-7366.

If you didn't manage to call them, visit their troubleshooting page and contact them through it.

If you bought your phone from MetroPCS and you are unable to use it with a SIM card from a different operator, try calling MetroPCS's support on +1 888-863-8768.

If for some reason you didn't manage to call them, you can contact them through their website.

If you bought your phone from Virgin Mobile and you are unable to use it with a SIM card from a different operator, try calling Virgin Mobile's support on  +1 888-322-1122.

If you didn't manage to call them, try to contact them through their support page.

If you bought your phone from Cricket and you are unable to use it with a SIM card from a different operator, try calling Cricket's hotline on 1-800-274-2538.

If you didn't manage to call them, click here to visit Cricket's website and contact them from there.

If you purchased your (smart)phone from T-Mobil (Telekom) and you are unable to use it with a SIM card from a different operator, try calling Telekom's support on 0800 33 01080 (Mon. - Fri. 8 am to 8 pm).

If you failed to reach them on the phone, try contacting them through their website.

If you purchased your (smart)phone from Vodafone and you are unable to use it with a SIM card from a different operator, try calling Vodafone's support on the following numbers: 0800 72 42 643 or 0800 72 42 600.

If you can't reach them on their phone number, contact them through their website.

If you purchased your (smart)phone from E-Plus and you are unable to use it with a SIM card from a different operator, try calling their support team on 0800 - 52 51 378.

If you purchased your cell phone or smartphone from O2 and you are unable to use it with a SIM card from a different operator, try calling them on 0800 - 52 51 378 or 089 78 79 79 40 9.

You can also have a live chat with them if you click here.

If you bought your phone from Orange and you are unable to use it with a SIM card from a different operator, try calling Orange's support on + 33 9 69 39 39 00.

If you were unable to reach them via phone, contact them through their website.

If you purchased your phone from SFR and you are unable to use it with a SIM card from a different operator, try calling SFR's support on 00 33 6 1000 1023.

If you were unable to reach them via phone, contact them through their website.

If you purchased your phone from Free and you are unable to use it with a SIM card from a different operator, try calling Free's support team on 0899 90 6000 or +33 1 78 56 95 60.

If you were unable to reach them via phone, contact them through their website.

If you bought your device from Bouygues Telecom and you are unable to use it with a SIM card from a different operator, try calling their support on 0 800 291 000 (from France) or +33 800 29 10 00 (from a foreign country).

If you were unable to reach them via phone, contact them through their website.

If you failed to unlock your device, consider buying a new one.

The don't know which mobile device to buy guide is a good guide for you, if you are not sure which mobile device to buy.