YES, you can. IF you have an unlocked code for your at&t phone with T-mobile service. If you don't have an unlocked code, go to your local at&t store and they will unlock it for you, And, you won't lose any information with your T-mobile plan when you put your T-mobile Sim card on your at&t phone.
you have to go online to buy a unlock code for the phone, once you have the unlock code you can put the sim card in and it will ask you for the code.
if not you can buy a sim card holder that can convert your tmobile sim card into the at&t phone so you have use of the at&t phone, but with tmobile!
get it?
yes, you can. as long as your sim card will fit in the sim card slot.
The T-Mobile phone needs to be unlocked and then yes you can!
An AT&T sim card will not work in an T-Mobile phone as it is locked to particular carrier itself... If you want to put your AT&T sim in your T-Mobile phone you can try unlocking your phone
Yes as long as the phone is att and has a sim card slot
No. The sim card would not be inter-carrier compatible.
Yes, provided your ATT phone is SIM unlocked.
Some cell phones are controlled with a SIM card. You may want to see if your AT&T SIM card will work a T-MOBILE phone.
Yes, provided your ATT phone is SIM unlocked.
The sim card will only work in a different phone if the phone is ulocked, in not, no
Could I put a simple mobile sin card to my HTC from ATT
if the phone is a prepaid phone, no. if it came on a plan, or bought outright, yes
yes, but i wouldn't do that. It should work on any phone including t-mobile and att
yes u can I had my att go phone unlocked and tried to use my sim card from st. talk which I found out uses att service towers in my area however, it didn't work. It stated "sim crash"
if it's unlocked I think so, if not, procedures all over internet