either call AT&T or you have to go to an AT&T store to activate it. If they can't, then you should buy a new SIM card
Yes as long as the phone is att and has a sim card slot
Could I put a simple mobile sin card to my HTC from ATT
Yes, provided your ATT phone is SIM unlocked.
An ATT universal card is a credit card. You apply for it like you do any other credit card, receive your limit, then spend. For more information you should visit the site for this, where you can find out rates and such.
Yes, provided your ATT phone is SIM unlocked.
Yes you can, you can go to an att store to buy the phone and have the people there activate it for you. Make sure it works before you leave tho because i left with it not working, found out later when i returned that if you register the sim card with the gophone you bought its locked with that phone, but its all good tho cause they will transfer your gophone number to a new sim card and set the new phone, samsung eternity, up for you. Also learned that all att phones, except iphones (with the new update) and blackberrys as of now, will work with the the att gophone. If your looking to buy a gophone and get a samsung eternity i recommend getting a cheap gophone, register the sim card with the samsung eternity not with the gophone you just bought. That will work as well
Yes!
Actually no.
Yes, you can flash a Verizon phone to ATT. However, you will also need to insert a Verizon SIM card into the ATT phone in order for it to properly work.
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"
You can put any SIM card in an unlocked cell phone.
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.