Do Republic phone work on any of the big 4 carriers?
The Moto G 3rd Gen will not work on any other carrier because of the modifications that are done to the operating system to work on the Republic network.
In case others find this question:
The Moto X1, X2, G1, G3, E1 and E2 can’t be used anywhere else.
All of the new phones can be used with any carrier they’re compatible with and will accept them. In theory the Samsung J3, Huawei Ascend, Galaxy S6, Moto Z and Moto Z Play will work with T-Mobile & AT&T (and their resellers).
The remainder of the phones should work with all four major carriers. (Although Sprint/Verizon don’t necessarily allow all of them on their networks).