I've been having issues since I got my 7+, running iOS 10.1 beta 1. When I had my 6s, I never lost service no matter where I'd go, I always had solid LTE. Now with my 7+, I get mostly 3G & 1x. Since I've updated to iOS 10.1 beta 2 yesterday, I haven't had a problem up to now. A solid LTE connection.
I thought a few threads back some users said the B2 didn't resolve the issue. I'm confused...