Iphone 4 dropped and now i can't make calls what can i do?

I dropped my iphone and the back broke but everything else is working fine excepts when i make phone calls the iphone automaticly gets in speaker but i hear anything and none can hear me
what can i do?

Put it in a microwave for 2 minutes, it will be ok.

Take it to the phone doctor

:|
hardware damage, so go to apple store

Get another lol