NickR1:
Apologies, mobile processes are probably the most foreign to me but this is incorrect. There's a clear process for disabling this function.
You're welcome to DM me your number and I'll remove Roaming capability and enlighten the agent you spoke to.
Thanks for the offer but I think I'll just remove the SIM card before take-off. I'll take a little zip-lock bag to keep it in while I'm away.