Do all ATT sim Cards work for all ATT phones?
With firmware version 2.0, AT&T SIM cards and interchangeable between any AT&T phone, including the iPhone.
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About AT&T
AT&T Inc. is the largest telephone service provider in the United States and the second largest mobile telephone service provider. They are just behind Verizon Wireless in terms of customer base with 92.8 million compared to 93.2 million. The company was originally founded on October 5, 1983.
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