Iphone 5 says no service even if sim installed or not installed please help

My iphone 5 running ios 8.1 says no service even if sim is installed or not installed. normally iphones say no sim when sim tray is out or empty but it says no service.I ve tried to reset network settings put on airplane mode but still the problem persists please help

In order until the problem is resolved:
Remove the current sim, clean the contacts, re-install the sim.
Take the iPhone to your wireless provider to get a new sim installed.
Take the iPhone to a physical Apple store for evaluation. Make a Genius
Bar appointment beforehand to avoid delay.
Make a Genius Bar Reservation
http://www.apple.com/retail/geniusbar/

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