My iPhone was unlocked and i restored it, Please?

I restored my iPhone but i had forgotten that it was unlocked.
i was using it for T mobile, it had a gevey ultra S chip in it, i tried to put it back in but it wouldnt read it.
my iphone is version, 6.0.1 & its under the verizon 13.0 carrier.
i don't know what to do, can i put the chip and make it work somehow? Or do i have to go and get it unlocked somewhere, i would appreciate if anyone could help me out.

Added (1). Oh and it is an iphone 4s!

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