Lg g3 not picking up tmobile signals tried everything.

Hello
I bought a verizon lg g3 from amazon since i heard that verizon phones comes factory unlocked for verizon.
I tried everything from changing the network setting to gms , global but it doesnt connect to tmobile signal. But after a network search it does detect tmobile , att verizon singnals.
I have not activated the phone using a verizon simcard.