I have the Moto G 1st Gen phone set up on an older $25 plan and I’m wanting to replace it with a Moto G 3rd Gen phone that I would be sourcing from somewhere else. Can I do this since I already have an active plan supporting a 3G phone? I can purchase a used Moto G 3rd Gen phone that was previously on the RW network and has it’s SIM card, or I can purchase a new Moto G 3rd Gen phone that is “unlocked” and w/o a SIM card. Can either of these be done and if so which would be easier? Really want to keep my old plan.