Is AT&Tt go phones compatible with at&t phone planes?

Im trying to buy a new phone for my friend for Christmas and he has an AT&T go phone is a AT&T phone compatible enough to work with his AT&T go phone

I'm trying to buy a new phone for my friend for Christmas and he has an AT&T go phone is a AT&T phone compatible enough to work with his AT&T go phone plan

or:I'm trying to buy a new phone for my friend for Christmas and he has an AT&T go phone is a AT&T phone compatible enough to work with his AT&T go phone plan

or:Sometimes you can just swap the phones, but AT&T might add extra monthly charges if the new phone is better than the old phone.

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