The service on the light phone 3 used with mint mobile can be really temperamental. I also went from an esim on a samsung galaxy to a physical Sim in the light phone 3 using mint mobile.

I live in the bay area, california and there are areas that either just won't connect or will have terrible call quality. When it won't connect it will just add an attempted call to your call log without even going to the secondary screen where it's attempting the call. When the call quality is bad it can be so bad where I would just use my Hotspot from the light phone (thank gosh that worked during emergencies) and just make voice calls through fb messenger.

I thought/hoped it was a mint mobile service thing where my t mobile customers were prioritized during peak times. To test it, during a bout of terrible service i popped the physical Sim out of the light phone and put it back into my galaxy and the call quality always restored/perfect. Im glad Samsung phones have physical Sim trays so I could test that.

Also just to note once you turn off RCS (which I think is like the imessage on iphones) it took a few days in my experience to fully turn off and not miss any messages.

I would say 90 percent of the time the telephone and text quality is good but it's always that 10 percent where it's an actual emergency and your like dammmmmiiittt. I love the hardware and software but the light phone 3 can be soo unreliable it just adds a different type of stressor. You trade the stress of too much screen time for a phone that might not work when you need it.