I currently have a Moto G 1st Gen phone with the original 1.0 RW plan and would like to stay with the plan. Would I be able to use the Moto G 3rd Gen phone (Moto G XT1540) with my 1.0 plan?
only the Custom ROM Republic Wireless Moto G 3rd XT-1548 can be used on a 1.0/2.0 plan
the Moto G 3rd unlock GSM has not been approved for 3.0 either
in short that phone will not work on Republic
You can purchase the Republic Wireless version of the Moto G (3rd Gen) and activate it as a replacement for the G1. The 1540 is not they hybrid Republic Wireless version.