Iphone 7 is looking service. WHY APPLE?

My iphone keep's going in searching, it had started friday when i put my phone in airplane mode and when i took it out it was in searching and now every once in a while it will find my service and then start messing up and not finding service for hours and even days.

Added (1). I have tried all of these and nothing should i just wait it out til ios 11 or should i contact apple as soon as possible. https://support.apple.com/...s/HT201415

That's an issue with your carrier provider, not Apple. Contact verizon, at&t, or whomever provides you with cellular coverage.

Check Apple Support about it