yesterday i dropped my iphone and it wouldnt turn on so when i got home i put it in the charger and that was the only way it would stay on and turn on.
but some problems are:
-it says no wi-fi and wont let me even press the wifi option
-only uses cellphone data
-didnt have any service when i first turned it on (but currently has service)
-not charging (staying at 90%)
Suggest you start here
You may well have damaged the iPhone
If nothing works make an appointment at the Genius bar of an Apple retail store
You can buy an out of warranty exchange for $149( $199 if a4S) or similar
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