This literally happened to me recently. Was going to Germany for 2 weeks and wanted to use a cheap eSIM for data only. I asked them if they could unlock my phone so I could do this, and they said no since it’s not paid off. I still have a new months left to pay it off, and didn’t wanna drop $250 to do that so I just had to pay the international data plan. $12(maybe $10? Can’t remember) a day, 10 day maximum charge per cycle so I’ll pay $120 for mine and $60 for my partners. Instead of the $11 30gb data plan I wanted. I’m never buying a phone from a carrier again, I will always just buy it outright from now on. It was a stupid situation.

Also the data roaming sucked, each time we moved from one provider network to another we had to restart our phones as the data didn’t wanna work…

Do you have a source for this? That was my worry tbh.