I have used an Airalo US esim without any issues, but it was back when they were aligned with AT&T as the roaming carrier. My current carrier is T-Mobile so there is no point in testing the service from Airalo on TM until I am roaming overseas. I will be going to Europe in a few weeks and will probably buy a weeks worth of service for Spain for the 6 days I'll be there though. My primary roaming service is intended to be a "Three" sim from Amazon in the sim slot on my iPhone 11 Pro Max. I suspect I will get the Airalo for either my 11" iPad Pro or Mini 5 for a $3 test. I'm anxious to test the quality and reliability of those 2 roaming services and also the IMS voice function while using those data services. I hope to give some user feedback back here and may be able to field questions or requests while overseas.