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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.
What else can I help you with?
Why wont my att sim card work in a t-mobile phone?
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
Can you put att iPhone sim card in an att blackberry?
Yes as long as the phone is att and has a sim card slot
Can you use an att go phone sim card in an unlocked t-mobile blackberry 8900?
No. The sim card would not be inter-carrier compatible.
Can i use a att sim card in a trac phone?
Yes, provided your ATT phone is SIM unlocked.
You have ATT but you really want a T-mobile phone is that at all possible?
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.
Can you put your att sim card in your tracfone?
Yes, provided your ATT phone is SIM unlocked.
Can a att sim card work in a centennial phone?
The sim card will only work in a different phone if the phone is ulocked, in not, no
Could you put a simple mobile sim card to your htc from att?
Could I put a simple mobile sin card to my HTC from ATT
Can you use a boost mobile sim card on a ATT phone?
if the phone is a prepaid phone, no. if it came on a plan, or bought outright, yes
Found blackberry pearl can you put your sim card and use the phone?
yes, but i wouldn't do that. It should work on any phone including t-mobile and att
Can you use a att sim card in a straight talk phone?
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"
Can i use a att sim card on virgin mobile lg paylo phone?
if it's unlocked I think so, if not, procedures all over internet
