The old sim cards may not fit in the new phones.
I upgraded from a Galaxy 5 to a Galaxy 10 and had to take the new phone to the AT&T store to set it up because my old Sim card was too big for the new phone.
Turned out great, they sold me an Otterbox and Screen protector for $5/each and I got 20% off an extra charging cord.
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MY ADOPT-A-CHIEF : Jody Fortson Jr.
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