Using ESims in USA

Hi all,
During my last trip to Boston, I activated mobile roaming a few times for Uber etc. but got a fairly hefty bill for my trouble
I’m Cyprus based and we don’t have much in the way of international roaming topups etc.
I’ve been looking at ESims and wondered if anyone here had used them and if so what was their experiences with them.
During my last trip to Boston, I activated mobile roaming a few times for Uber etc. but got a fairly hefty bill for my trouble

I’m Cyprus based and we don’t have much in the way of international roaming topups etc.
I’ve been looking at ESims and wondered if anyone here had used them and if so what was their experiences with them.