IPhone 3GS "no service" after flying cross country

Showing up first while I on a recent trip from Dallas to Cleveland, my iPhone 3GS has since often had a "no service" message in the upper left corner of the screen so that I can't receive or make phone calls. It's also sometimes having trouble getting a connection for Words With Friends, and Messages and Voice Mail often have a big red dot on one corner instead of a red dot with a number inside, along with the message that I don't have a connection.
A Genius told me it's not uncommon for iPhones to get confused after travelling across time zones, and he recommended that I Reset Network Settings. That didn't work, so I Reset All Settings, then, because I'd already tried restoring from a back-up, I did an Erase All Content and Settings and synced again to get all my media and such back on the phone. Nothing seems to be fixing all the problems at the same time.

i do not really know if it was jailbroken in the past i brought this iphone from a friend and it work perfectly on ios 5.1.1 and it was not jailbroken when i first used it. the problem i do not understand is that the no service problem never occured before the update to ios 6.1.3  . is there any way to fix this problem? because i would like to continue using my iphone 3gs
  I have tried to downgrade to an older version of ios using an ipsw but still the same problem

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