no cellular network

Rzmer,I'm having the same exact problem as you described, I took my phone to a tmobile store they registered me on the esim card,and took the removable sim card out ,but still having the same problem, and my phone started acting seems like after the last security update ,this is very annoying, I'm missing very important calls,and I'm experiencing dropped calls also very often ,and I always have to restart my phone, this is extremely annoying, paying phone service that barely works, I'm thinking of going to another carrier, I never had this problem under sprint.