Can you use a tmobile phone with a ATT sim card?

Answer 1

Yes you can. Tmobile an AT&T both run on a GMS frquency.

Mymalathy answer:

You need to unlock from AT&T Network lock,then you can use the T-Mobile Network,You can use the unlock code to unlock it... after unlock it use your phone with any GSM Network Sim card..

Answer 2

Right out of the box, it most likely will not, unless it was unlocked.

However, both AT&T and T-Mobile operate on the same type of network, GSM. So if you put in a SIM card from a T-Mobile phone into an AT&T phone, then it will most likely ask for the Unlock code. You can get this from different places, however T-Mobile is known to give people the code so that you can use it.

Addition: Answer 2

The Unlock code is slightly different than actually having the phone unlocked. To have it unlocked is something regarding the software inside the phone, that can be altered by a computer. The unlock code is just to access Phone restrictions and security features. MOST phones are locked, and cannot be swapped on sim cards. So far the only phone i have successfully made work on both providers is the Apple iPhone, and that was a Jail broken one.

Joseph's Answer:

Unlocked Cell Phones Can Be Found ALL OVER THE internet ALL DAY LONG.

Search Ebay. Update Yourselves...But Do Not Try and Put The Fear Of God Into Me.

Answer 3

An unlocked AT&T phone WILL work with a T-mobile sim card. I have an AT&T Razr that works with either AT&T/Cingular or T-mobile, depending upon which sim card is inserted.

I called AT&T/Cingular customer service to get the unlock code for my phone - in California, cell-phone companies have to give you the unlock code if your account's been in good-standing for at least 90 days.

Answer 4

If you mean putting an at&t sim card in a t-mobile phone, no. Sim cards only work in phones that are the same brand.

Answer 5

If the T-Mobile phone is unlocked meaning the network unlock code has been given to the phone. Contact T-Mobile for the Unlock code after you have an active AT&T account and sim card.

Answer 6

Yes - providing the t-mobile handset has been unlocked.