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How can I tell if a straight talk phone can be used with an at&t sim card.
My mom had a Samaung Galaxy S7. She brought it at Wal-Mart and has had it for 2 years. I wanted to switch her to my At&t plan. At&t gave me a sim card for a line I already have. When I put the sim card in her phone it says no network available. Please help.