I havent had a signal for 12 hours

My Iphone 4s has totally lost its signal and has been like that for 12 hours. I have tried switching it off and on, cleaned the sim card. and have also contacted my network provider to which they say its the phone and not the sim. Any ideas???

After charging for 12 hours or so,
Try:
- iOS: Not responding or does not turn on
- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful that indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar

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