free trial tmobile (esim)

I have never used an eSIM, but I'd like to know about them. Can anyone explain what are some reasons to use it?

I'm using Roamless because the eSim is pretty cool, automatically swaps to whatever country I'm in, rates are near local prices, and the best part is it's pay as you go and your balance doesn't expire. There's plenty of other good services too, but they charge for a certain period of time while still being limited data. Some are unlimited which are pretty cool though, but haven't seen another service that's able to swap between countries like Roamless though.

The problem I had with products like Airalo is that if you are traveling and need to actually call a hotel, excursion, or any company in the country you are visiting you cannot do that with just a data eSIM like Airalo.

Sure you could use WiFi calling maybe but in my experience when I really needed to call someone I had to switch back to my original carrier and incur the $10/day fee.