Can I Use My T-Mobile SIM Card on a Prepaid T-Mobile Cell Phone?by Eric Fenton
With the broad variety of cellphones available to consumers, it's common for a cellphone owner to want to switch phones during the course of their contract. In most cases, switching to a new phone requires little more than swapping out the SIM card.
The SIM Card
The Subscriber Identity Module, also known as the SIM card, is a small memory card located on the back of most cellphones. This card stores the identity and settings for your phone. This card, in effect, is what directs phone calls to your specific device when someone dials your phone number. Without the SIM card, there would be no way for your phone to decide which calls are for you and which aren't.
In addition to storing and making use of your phone number, SIM cards also store a cache of useful information. The most common information saved on a SIM card, aside from the user's phone number, would be the user's contacts list, as well as the user's call and text history. You may find yourself wanting to transfer a SIM card if your phone breaks, or even if it runs out of power and you have a charged phone handy.
Transferring the Card
Transferring a SIM card is as simple as sliding the card out of one phone and placing it into another. Most SIM cards are found on the back of a phone under the battery, and do not require any technical expertise to remove. It's possible to damage your SIM card, so when transferring your card, always be sure to treat the device with care and never leave it simply lying around.
SIM cards for a specific carrier brand of phone can always be transferred from one to another, regardless of whether one phone is prepaid and the other is not. However, generally SIM cards can not be transferred to phones of a different carrier. However, if you're using a T-Mobile-branded prepaid cellphone, any activated T-Mobile SIM card will work.