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I have had this problem too- have you guys tried to charge it ? Also maybe take the battery out and put it back in and check- I've had to do that a few times to get my phone to work
when you upgrade to ios 5 its no longer jailbroken and therefore your sim isn't being recognize. as probably your iphone is locked to at&t or verizon while your sim is from a different company then the lock.
plug in your charger and try to turn it on, if nothing then check the battery. Check the voltage on your battery with a meter. If voltage isn't present or lower than it says then try a new battery. If that doesn't work it will need professional repair.
It seems that the proximity sensor on your iPhone isn't working properly. The iPhone's screen should turn off when it is close to your face. If this does not happen, bring it into an Apple Store and they should replace it for you. (if your iPhone is still under warranty)
I would at least wait for the iPhone 5 which is rumored to be available this year. You may have to wait for some time for the iPhone 6 since the iPhone 5 isn't even available yet.
Of course, if you need a phone as soon as possible then I would go ahead with the iPhone 4, it's a great phone!
If your iPhone's battery runs very far down, the iPhone won't turn on. That's because it's using its remaining battery life to preserve your data and settings.So, your iPhone could be refusing to turn on because its battery doesn't have enough juice. In that case, plug your iPhone into a wall charger or into your computer (plug it directly into the computer; some USB ports on keyboards don't have enough power to charge iPhones). Let it sit for 10-20 minutes. If it was low on battery and needed a charge, when it's got enough juice to power the screen, it will turn on and show you its charging status, starting with the red battery icon.During this process, you may also want to make sure there's no lint packed into your cable or the iPhone's dock connector. This isn't a hugely common problem, but a lot of pocket lint could interfere with the iPhone getting a charge.
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