Currently Being ModeratedNov 27, 2012 6:30 AM (in response to karlion)
As far as I know there are no unlocked iPhone 5's sold in the US yet, so you probably bought a "no contract" phone, not an Unlocked phone.
So first, does the receipt say "unlocked"? If it does call Apple in the US and they may be able to fix it. If it doesn't say "unlocked" you can try calling AT&T, but there's no guarantee that they will unlock it.
Finally, there is a (small) possibility that it really is unlocked. To find out you must connect it to iTunes and Restore it. If the restore upgrades it you will have to restore it a 2nd time. If the phone is unlocked you will get a message from iTunes that says "Congratulations! Your iPhone is unlocked."
Currently Being ModeratedNov 27, 2012 6:58 AM (in response to karlion)
The only place you can purchase unlocked phones in the U.S. is direct from Apple. No 3rd party retailers (including Wal-Mart) are authorized to sell unlocked phones. It was reported a while ago that AT&T iPhones purchased as no-commitment phones would be unlocked if you plugged them in and restored them using iTunes (have you tried this?), but no official statement has been forthcoming from AT&T so far as I'm aware.
Currently Being ModeratedNov 27, 2012 7:55 AM (in response to KiltedTim)
I believe it's a no-commitment AT&T phones and I restored it with my sim card using ITunes. However the screen still shows " SIM NOT Valid ", "Only compatible SIM cards from a supported carrier may be used to activate IPHONE. Please insert the SIM card that came with your IPHONE or visit a supported carrier's store to receive a replacement SIM card" .
I contact AT&T , submit unlock request and ask my brother in CA to fax the recepit, then the web status shows :
I call AT&T , she just said I have to wait couple days. But is this normal with the above status.
I think I will refund it in the Walmart. For the whole event it's the ony lucky thing that I work in Airline.