Been using mint for years. I like it a lot because it's cheap and I generally don't use much data so I apt like $200 a year for...3?4? Gigs. I generally get pretty decent signal is most places besides at home and in other remote areas, but wifi calling is super easy to enable on most phones. Your phone choice matters. My spouse has also been on mint for years but their phone (I think is a Samsung s8 ) gets jack shit in the weirdest place. Like downtown Montpelier, no signal ever. But my Samsung a51 has gets fair signal there.

Over all though, I love it and am glad I made the choice to give it a go those 6 plus years ago.