Upgrade phone

To switch my phone from moto g3 to moto g4 do I need to get a new sim and change my plan also?

Yes and Yes. If you buy the new phone from RW it will come with a SIM.

Yes you will need a new plan, if you BYOD you will need to order a 3.0 GSM SIM [and you will be moved to Republic GSM partner network [T-Mobile], if you order from Republic it will come with 3.0 SIM on the network that should work best for you [your current CDMA [Sprint] or GSM [T-Mobile]]

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