Originally Posted by
Zeeb
Thanks for the suggestion and the link. We'll err on the safe side and just remove the physical SIMs - and the phones are an iPhone 12 pro and an iPhone 13 pro. Purchased unlocked from Apple so they've never been carrier locked or had any Verizon stuff loaded on them.
Removing the physical SIM means you won't be able to receive SMS messages or voice calls on your existing line.
Just switching off Data Roaming on the physical SIM line will ensure you won't get any roaming charges.