You don't need this number when you change your phone number with AT&T. This guide explains what an AT&T transfer PIN is, where to find it, and how to use it when switching to a new carrier.

BENTONVILLE, Ark. -- Wal-Mart Stores here has chosen AT&T as its new prepaid calling-card vendor.&T will distribute more than $100 million worth of prepaid cards through Wal-Mart ...