Why can't i hear the sound in my iphone 4?

Okay so i can hear like ny ringtones and stuff but when someone calls me i can hear their voice but when i talk they can't hear mine. I was screaming too. And when i record videos uou can't hear my voice either. I haven't dropped my phone and haven't gotten it near water. What do you think is wrong?

Which case should I buy for my iphone 4?

I just got an iphone 4 and I'm trying to decide which case would be best for me. I have been looking primarily at the otterbox defender and commuter cases. I'm prone to dropping my phone on occasion, which causes me to lean towards the defender, but I also don't want my phone to be inconveniently large, which is a pro of the commuter. Does anyone know how well the commuter holds up against occasional drops? Which case is better? Are there other better cases out there I should be considering?

My iPhone isn't sending pictures?

I just got an iPhone 4 yesterday and sent one picture right when I got it (I might add that it send perfectly fine in my basement) and as of last night and today, the sending bar makes it to about 90% and just stops. And then the delivery fails. I have 3 bars and have tried sending outside as well. I checked my wireless plan and have confirmed that I DO have unlimited MMS. Yes, my MMS setting is turned on. I have tried turning it off, then on again. I have also turned the phone off and back on and tried resetting it. It is sending texts fine but it is really annoying me about the pictures. My old phone sent pictures FINE from my house. I might add that I have Verizon. Any clues?

IPhone broke won't turn on what should I do?

Hi, one of my friends gave me their old iPhone 3GS after they got an upgrade and its about 5 months after I got it, it broke yesterday what should I do?

Added (1). It turns on just the screen doesn't work neither does the digitizer

How to set up my voicemail on my iphone 4?

I've had my iPhone 4 for half a year already but I never got around to setting up my voicemail. Can anyone help me? I tried asking Google, which told me to go to phone, then the voicemail icon, the record a greeting. Well, I tried that, but when I tried saving it, I was waiting for like 10 minutes and it still hadnt saved! Any suggestions? Did i not wait long enough?

Grayed out Wi-Fi on iPhone 4S?

How can I fix it? I have tried like everything but it doesn't work.
I know many blogs say to put it into the fridge or use hair dryer but I'm not doing it I don't want to risk damaging my iPhone so any reliable suggestions?