At least once every day my I Phone 6 shows no service (signal) after rebooting shows full 5 bars. This is extremely frustrating as if one is not watching the signal strength the phone is effectively shut down.
iPhone 6, iOS 8.3
Where are you?
Which carrier?
Is iPhone imported?
What other troubleshooting steps have you done?
In the Philippines, Carrier is Globe Telecom, phone purchased from Apple here. I know many other people that have the similar problem. My wife was told by Globe that her sim card needs to be refreshed ( changed)
Try Settings > General > Reset > Reset Network Settings
and do a force restart: http://support.apple.com/en-us/HT201559
If no joy, make a backup and restore as new without a backup and test.
http://support.apple.com/en-us/HT201252
Talk to them and also try using a new sim from Globe.
Everyday my Iphone 6 shows no service and has to be rebooted and immediately shows full 5 bars.
