Can any AT&T phone be used as a prepaid phone

[Disconn3cted]

I don't want a phone I'm just wondering. I heard if you put a sim card from an active go phone into any AT&T phone it would make that phone prepaid, but what if you the phone was never activated?

[xKingpinx]

if the phone was unlocked im sure...there are certain phones which are considered unlocked...so you can put in your own card or w/e...and use it for any service I think...

[Plutonium]

it doesn't matter if the phone is unlocked or not... he said he's going to put an att&t sim card from an att prepaid go phone to "any AT&T phone ".