Can SIM card fm Moto G4 be switched to a Samsung J7 or do I need a new card?
Maybe. When you open the Republic App on the G4, and click the little gear at the top, and then about, what does it say there for SIM Type? If it says GSM, it can be moved to a new phone without issue.
That is a GSM only phone is it not?
It is. Relevance?
If they have or need CDMA…that phone will not be good for them.