“Important message: If you updated to iOS 10 your iPhone may experience intermittent connectivity issues. You can temporarily resolve this by restarting your device. We will notify you immediately when an update is available.”
Oops. I updated two days ago even thou my coworker had mentioned a ton of people are having issues. I told him “I like to live dangerously”
I experienced the connectivity issue today when I received a phone call at work. I had 3 bars but the call was cutting out. I hung up and called back on a land line and there were no issues. Later I received another phone call on my iPhone and there were no issues.
Apple is suggesting a reboot as a temporary fix.