Pretty much to me they’re magic. I put them in and the phone works. Abut two years ago, whenever BYOP came, I got two SIM cards from Republic. I put one in Moto G4 Play, works great!
Now I want to upgrade to a G5 Plus, fifth gen, on Amazon. Two questions:
Can I use the old unused SIM card from two years ago, or do they change or upgrade over time?
And/or, can I use the current SIM card in the G4 Play? Would it be better to do that? Or would I be better off with a fresh start with the old unused SIM card?