My personal experience in Mexico (on two separate trips) trying it on an iPhone 13 has been hit or miss. I couldn’t get it to grab signal despite many restarts and attempting different carriers manually. Eventually it connected after a day of fiddling, but if I needed to restart the phone, it was back to square one.

I eventually gave up and just bought a cheap local SIM card that worked like a champ.

Another note, if you’re using graphene os on android, you must install google play services to use Esim, so that’s why I tried it on an iPhone.

Maybe I’m the anomaly though!