[gambiting]

The only thing that happens is your data becomes a lot more expensive, the card still continues to work as normal. I've not lived in Poland for over 15 years now, and I still have a polish SIM card that I use almost daily - the only thing that I've lost due to roaming long term is cheap data packs, I can still call and text as normal from my monthly allowance.

[kube-system]

Maybe in the countries that you are familiar with that is the case.

In some places your plan will be cancelled for roaming beyond a certain number of days or quantity of usage. Telecom laws and polices vary widely.