In case you are willing to port your phone service from T-Mobile to AT&T, but you do not want to change your present T-Mobile phone, then you can be lucky enough to retain your number. You can use your AT&T Sim card in your T-Mobile phone.
Many of the GSM mobile phones, sold by the T-Mobile, are also compatible with AT&T, but only when they are unlocked for multiple carrier usage. You must only need to know that which mobile phones are compatible with AT&T and how they can be get unlocked for multiple carrier usage.
Step 1.
Find out the "Calling Frequencies" your T-Mobile Phone. The currently available frequencies are 1900mhz, 1800mhz, 900mhz and 850mhz. Most of the T-Mobile phones operate on the frequency of 1900mhz. However, some of their phones also offer two or three and even all 4 of these frequencies.
To operate through AT&T, your device needs to work on 850Mhz AT&T frequency.
You may find the available calling frequencies for your device in the user manual of your phone or it can also be found on its original retail box. In case you don't have the user manual or the original retail box of your phone, then GSMArena is a trustworthy domain for GSM specifications.
Step 2.
Check out how long you have been using a T-Mobile device. In case your contract is of 121 days or more, then T-Mobile will customarily provide you the "unlock code" for free.
However, if the current contract on your phone is for less than 121 days, then the T-Mobile will not give you the “unlock code.” In this case, you will need to call the T-Mobile customer service on their toll-free helpline number, which is 1-xxx-Tmobile and then, asks for the unlock code of your device.
Enter the unlock code precisely as it is provided by the T-Mobile customer service representative. Once you have entered the code correctly, you need to reset your mobile device in case it does not do so on its own. Thereafter, put in your AT&T Sim card. Your device must now pick up the signal.
Step 3.
The “unlock code” will normally include typing a set of numbers along with some of the other keys of your device. For instance, pressing down the 2 soft keys of your mobile phone while typing "#1xx3_" and then, typing a code, such as "_1xx4." This process may be largely based on the requirements of your device.
Step 4.
You can also buy the unlock code of your device online if T-Mobile service did not provide it to you or if you didn't purchase the locked T-Mobile phone from the service provider.
For most of the mobile phones, “GSMLiberty” is something you can bank on as a mobile unlock source. You would require to give the site your phone's "IMEI" number, which is usually mentioned at the back of the battery of your phone. Enter that unlock code exactly as provided in order to make your device ready for AT&T. Now, put in your AT&T SIM card and then, check the phone for a signal.
Step 5.
Set up the service options of multimedia messaging through the menu of your phone if you are planning to use multimedia messaging service (MMS) on your phone. Each service carrier's MMS settings differ, depending on the phone you have. You may get MMS settings on popular mobile phone websites, such as “HowardForums” and also on the AT&T Wireless webpage.
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