Same exact issue. I'm on Verizon, with 256 GB iPhone 7 in Maine. First noticed on Saturday after setting up my iPhone from a backup of my iPhone 5s. I'm now keeping a precise log, have experienced 10 gps and cellular drops in the last two days, almost all are different locations, mostly along interstate highways where there's almost always very good cellular coverage, also areas where I've never had a problem with my previous iPhone 5s.
Have:
- updated carrier settings
- updated iOS to 10.0.1
- performed both "soft" and "hard" resets
None have helped.
Have talked with support but representatives want me to speak with my original representative. Very difficult with my schedule to get back to a specific rep. (WiFi calling also not working(?), and no cell signal inside work building).
I'd love to try to help resolve this issue if someone at Apple would like to contact me.