My phones are on Consumer Cellular and will die in a few months because they don't have Volte. I just read that Verizon isn't dropping 3G until the end of 2022, so we can squeeze 9 more months out of them by changing to a Verizon MVNO.

Assuming I am right in thinking the phones will work properly on Verizon, what will happen when I switch carriers? Will my photos, contacts, and messages stay on the phone, or do they go with the SIM. Or will just backing the phone up, changing SIMs and restoring save everything?

Any help would be appreciated.