I recently switched from T-mobile to Verizon. The verizon signal on my iPhone 8 keeps dropping. I live in seattle city with excellent LTE coverage throughout. If I switch to airplane mode and back, or restart, the signal resumes immediately (with full LTE) and then drops again after a minute or so. It shows "No service".
Verizon has already provided me a new SIM, but the problem still remains. I never had this issue while using my iphone 8 with T-mobile. I suspect it has something to do with Carrier settings on my phone, but I cant figure out what exactly is the problem.