Message "no service appears" at the top.  How do I get it back?

A message "no service" appears at the top of my iphone4.  How do I reset it?  The name of my network does not show up in carrier settings like it used to.It just says automatic.I cannot phone or receive phone calls or messages.

If you are in the same physical area where you formerly had service, it sounds like an issue with your cellular carrier.  Either they did something to your account or (less likely) perhaps they have an issue with their towers.
Contact your cellular carrier.

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