'No Service' phone signal on 3GS

My 3GS suddenly stopped receiving a phone signal despite seaching.  An iPhone 4 next to it sees the signal.  I've completed a reset, removed the sim and reinstalled, turned Bluetooth off.  WiFi is OK but with Carrier set to manual it won't see any service provider at all so no phone signal.  I've run out of ideas on this.  Any clues?

It was given to him as a gift by a cousin, brandnew at the time. That’s what I have been told and why I am not giving up on it being some other issue that can actually be fixed.
As for Settings>General>About>Model, here is a screenshot:

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    You must be a Windows sufferer.
    http://support.apple.com/kb/TS3694#error1611
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