My iPhone said needed to upgrade iTunes and had no service.. Upgraded and still has no service

My iPhone will not work after being upgraded thru iTunes.  Will not work at all

Have you tried a power off/on?  Or a reset, hold sleep/power button and home button for at least ten seconds, ignoring the red slider?
Have you tried to reconnect to iTunes and do a restore?
Are you using iTunes 10.5.1?
If none of these work, it might be a good idea to visit an Apple Retail genius bar and have it checked out.

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