I'm glad I stumbled across this: life circumstances have allowed me go abroad for a trip the past two years. One thing I had forgotten about since the last trip were some of my group being unable to get one of the cheap prepaid data eSIMs because their phone was still locked to the carrier. I've been tempted to replace my aging iPhone SE 2022 (^1) with a trade-in deal and get a new phone, but it never occurred to me that would mean being forced to use AT&T's $10/day (capped at $100 in one billing cycle) "International Day Pass" during future trips until it had been paid off for long enough.

(^1) I wish I wasn't so tempted after ~4 years, but the battery health has dropped to 75% and the performance has suffered dramatically. A new battery is on the table I suppose, but I am split between just putting that money towards a new phone.