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How can a tmobile 5s work on verizon if verizon doesn't activate phones not meant for their network?
 
How can a tmobile 5s work on verizon if verizon doesn't activate phones not meant for their network?

This. As far as I know, Verizon doesn't Activate phones off their network.

Additionally the model numbers on the T-mobile 5S and the Verizon 5S are different.
 
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