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Yes, provided your ATT phone is SIM unlocked.
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"
No. The sim card would not be inter-carrier compatible.
I have been wondering this same question also. With my broken att goPhone I transferred the sim to a working RAZR v3 and an ATT Tilt. Niether of them worked as they both said no service. So the answer is NO.
An unlocked phone can accept the SIM card from any cell phone provider. If you have an ATT SIM card, you can use it in an unlocked phone. A locked phone is created by the provider to force the use of its service; an unlocked phone can take any SIM card.
none verion uses cdma and rest use gsm tech.
If the Galaxy handset has been unlocked - yes.
no, your # and plan details are on you SIM
Legally you do. But you can unlock your iPhone with the pwnage software which allows you to use any service that has a sim card.
Virgin Mobile now uses sim cards and ATT and other carriers only what customers to use their phones, so the phones are locked for use only on their network. If you get an unlocked cell phone you can use it on any carrier that uses sim cards. NOTE: Tmobile and prepaid carriers don't have Iphones on the service.
all iphones have a sim slot but on the original iphone the customer cannot easily access it whereas the 3G iphone has the sim card and a sim card ejector tool How can I access my verizon iphone 4 sim card slot that doesn't have a sim tray
if it's unlocked I think so, if not, procedures all over internet