Yes as long as the phone is att and has a sim card slot
Yes, provided your ATT phone is SIM unlocked.
Yes, provided your ATT phone is SIM unlocked.
Yes. AT&T stores carry SIM cards.
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"
Yes!
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
Yes because ATT phones have sim cards, so you can simply transfer your sim card to another phone. However, the ATT website doesn't sell all their phones for use with gophone plans, so depending on the phone, you might have to buy it used or from another vendor.
any AT&T phone that can take that sort of sim card.
No. The sim card would not be inter-carrier compatible.
ONLY if the handset has been unlocked from any network.