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Let me give you a little background and then some solutions. This is generic because I don't know of T-Mobile since they are merging with AT&T. So I'll provide the AT&T information.
Phones are naturally unlocked, but a service provider might lock them
When originally manufactured, all GSM cell phones are unlocked. That is, they can be used with any SIM from any cellphone service provider - always assuming, of course, that the cellphone service provider has compatible GSM service on the same frequency bands that the phone can operate on.
Most cell phone service providers electronically 'lock' the phone so that it can only be used with their service. There are obvious reasons why they choose to do this - in particular, to force you to pay what are usually very high roaming charges when you take your phone out of their network and use it elsewhere in the world.
Fortunately, this locking is reversible. With some phones, it is possible to simply enter an unlocking password code into the phone and it is immediately then unlocked. Other phones need to be connected up to a special unlocking data terminal.
Your phone has to be unlocked by the carrier. LG, Motorola, Sony Ericsson, Nokia and most of their ilk, will not give consumers the unlock codes but don't despair.
A PUK (PIN Unlock Key) code is required to unlock SIM cards that have become locked following three successive incorrect PIN entries. If your SIM card becomes locked, you will need to get a PUK code from your carrier. For example, if you want AT&T to unlock your SIM card, you can obtain your phone's PUK code from AT&T by:
● logging in to your my wireless Account online ● using their Technical Support Chat ● calling Customer Care at 1-800-331-0500
To get your phone's PUK code online from ATT:
● Log in to your my wireless Account. ● Select My Services under My Account. ● From the My Services screen, select My Phone/Device. ● Select Unblock SIM Card. ● The Unblock SIM screen will display your PUK code.
Once you receive your PUK code, you will need to enter it into your phone to set a new PIN code.
Note: If you enter the wrong ATT PUK code 10 times in a row, your SIM card will be invalidated, and you will need to purchase a new SIM Card. The phone will display the following error: "PUK blocked call operator."
There are three other ways to unlock a phone:
● The carrier will unlock the phone for you at one of its retail outlets; ● You can do it yourself by clicking on this link Free Unlock Codes , ● Pay $3.89 at the following website: www.theunlockshack.com/.
I trust that this is helpful and solves your problem. All the best
Enter the last four digits of your phone number on your cell phone PIN screen. When setting up a cell phone PIN, the default number assigned is the last four digits of your cell phone number for most cell phones.
Enter 9999, and if that doesn't work try 1111. The number sequence 9999 and 1111 are other standard numbers assigned when choosing a cell phone PIN.
Shut off your cell phone, take off the back of your phone and pull out the battery. Record the IMEI number under the battery. Reinsert the battery and power on the phone. Enter the last four digits of the IMEI number on the PIN entry screen. The last four digits on your IMEI number can occasionally be the service provider's preset PIN for the cell phone.
Call your service provider and request the PIN. You will have to prove you are a customer by stating your cell phone number, address and Social Security number.
Turn off your phone. Hold the keys "3," "*" and "Call" and switch the phone on. Hold the three buttons down until the word "Formatting..." appears on the screen. This should reset the phone lock code.
Go to one of the links in the Resources section and have your IMEI number ready. These websites will ask for your phone model and IMEI number and then charge you a set fee for the unlocking PIN.
I purchased an AT&T Go Phone to use it's sim card in my gsm module. It did not work. I called AT&T and they told me the gsm module is not supported. I then purchased a T-Mobile prepaid phone and installed it's sim card in the gsm module and it works perfect every time.