Why is my iPhone making a buzzing noise?

Whenever I play music or any sound is made on my iPhone 4s (which I have only had a couple weeks) it sounds like the speakers are sort of buzzing. Like the music isn't clear. It sounds like if you were listening to the radio but it wasn't tuned properly. What could be wrong and how can I fix it?

Why do I do these annoying habits?

I have these extremely annoying habits that I do almost every hour of the day. I don't know why I do them but I do and if I don't, I will literally feel sick or like I'm about to cry/scream.
I always:
- trace the edges of my iPhone and go over the homebutton with my thumb so it fits perfectly
- trace the corners of basically everything I touch, as long as I realize I'm doing it; ex.TV, laptop, back of chairs, keyboards, power buttons, etc)
- push my elbows into my ribcage when I'm sitting (I really don't know why)
- if I hurt one part of my body, the opposite parts has to hurt EQUALLY as much (ex.knees, elbows)
- if I feel like a key on my keyboard isn't being used enough, I will have to use them even if the word I'm typing doesn't have that letter ( common with a, s, d, q and w)
- repeat entire paragraphs/sentences if I think I said one word wrong or too fast or not with the right expression
- I always think I left my door open when I leave for school and that my dog will escape, even though I know I closed it

There are many others, but I can't explain them. Someone Please tell me why I do these things?

Delete Stuff on iPhone via Laptop?

I need a way to delete an app and some songs from my iPhone, but all I have is my laptop. Is there any way I can do this via iTunes on my laptop? Or if there's a way to get into my iPhone's restrictions and change stuff. Please don't ask why, just answer. Any solutions?

Added (1). I don't know where my iPhone is, so I can't plug it in to my laptop.

Can I buy an iPhone 4S with no contract?

I have always wanted an iPhone 4S but my parents say its to expensive to pay monthly so I was wondering if it would be possible to get an iPhone 4S with no contract and not activated so you can text or call and can't activate it. Can I? And where can I get a good deal if so.

Can't use imessage on Iphone 3g?

I use to have an iphone 4 that was not activated i would send messages and photos to other iphones using Wi-Fi through my apple ID. Now I downgraded to the iphone 3g and it doens't let me send imessages at all. I would like to be able to use it like an ipod and not really have to activated it.Am i still able to use the imessage through Wi-Fi if so how can i fix this?

How to remove iphone mail account?

My friend has my email and password on his iphone, and I want it gone. He won't remove it, and it's his iphone, so how do I remove it? Does changing the password on its own work? Is it enough? Or do I have to do something else?

How to fix the sound on my iPhone 4?

I have the iPhone 4 and when i got it i downloaded an app and the audio didn't work. I had the sound fully up and it did not work. I can't turn up the audio unless i'm in music and sound doesn't work on anything but YouTube, Skype, Camera/Photos and only texting apps, I have not used the phone on it yet so i don't know if it works or not. My setting on sound are, Vibrate on Ring off, Vibrate on Silent off, Ringer and Alerts (Full), Change with Buttons on, Sounds and Vibration Patterns (All set to something) Lock Sounds off and Keyboard Clicks on!
Please help, i really want it to work, i would get an iPhone 4S but i'm not sure if i'm able to return this iPhone 4.

Added (1). There's no mute, so mute was never on