The SIM card numbers can tell you if they are AT&T, T-Mobile or Verizon. You want to look at the digits 5, 6 & 7 on the sim number and use the following to determine the communication provider.

The first 4 digits of AT&T and T-Mobile SIMs are 8901:

AT&T (030, 150, 170, 410, 560, 680)

T-Mobile (026, 160, 260, 490)

T-Mobile (026, 160, 260, 490)

Example: For SIM number 8901260882217567038, digits 5,6,& 7 are 2-6-0, which is a T-Mobile SIM

Verizon sim numbers start with 8914:

Digits 4, 5,& 6 indicate which Verizon network it uses.

Verizon (004, 005, 012, 480)

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