My iPhone video sound won't work?

It's been like this ever since I bought this new phone I currently have, when I record a video and and play it, there's literally no sound what so ever and it's the same with recording voice memos to remind myself for stuff, I can kind of bear my self but it sounds really shaky and fuzzy but it works fine with audio messages for iMessage? How can I fix this?

Fixing a disable iPhone due to forgetting passcode?

I tried multiple time and watched many YouTube videos but it won't work. IPhone 4. When it's downloading it just turns on and something pops up on my computer saying that I must enter the passcode first (which i don't know) I'm trying to fix it for my friend as a birthday present. It only downloads a little bit.

How to make the bass better on my iPhone earphones?

I have an iPhone 5c. And I do not use the iTunes music, I use a music app so I can get my music for free. And I use iPhone earphones. Yes, I have already turned on the bass boost on the equalizer in the settings. I don't think it works for music apps. Please if you know how to make the bass better tell me. I want the bass to boom through my ears!

IPhone 5c camera not working? - 1

So a while ago, my phone's camera stopped working because of storage problems. I could usually get around this by using the snapchat camera to take me photos, but two weeks ago my snapchat camera stopped working also. I realized that most of the storage in my phone was being used up by photos and camera (2.5 GB in the photo library) So I transferred all the photos on my phone to my macbook and deleted all the photos on my phone. Despite this, my phone only gained a few MB of storage and my phone is still saying that photos and camera are taking up over 2 GB of storage. Neither my snapchat camera or my phone camera work and I now only have 10 downloaded apps on my phone, none of which are taking up much space. I don't know why my storage is still really low, even though I don't have any photos on my phone. Can someone tell me why this is happening, and what I can do to fix it.

I have done things such as turning my phone off and on and resetting it multiple times. I have also tried to delete and redownload snapchat but the camera is still black and doesn't work.

Age required to trade in iPhones?

I'm 17 years old and I want to trade in my iPhone 6 into Gamestop for some credit towards a PS4. So what age do you have to be in order to do this? I have a state ID (learner's permit) to show them my age. Please don't tell me to sell it on Amazon, Ebay, or Gazelle.