How to restore iPhone 5 to iOS 6.0.1?

I have a jailbroken iPhone 5 on iOS 6.0.1. Recently when i use the phone, I can hear the other caller fine but all i here is static. I need to restore my iPhone to 6.0.1 I won't restore to 6.1.4 because i'm not willing to give up the jailbreak. I have never updated to anything higher than 6.0.1. I really need your help!

Iphone 4s problem, can't make calls?

I need help! When I call someone, or use voicemail. I can't hear anyone and no one can hear me. Everything else works fine on the phone. I tried everything, restarting, refreshing… What am I doing wrong!

If my laptop has bluetooth, and I connect it to my iphone, does it use my data?

Depending on where I'm I don't have Wi-Fi connection, but my laptop is able to connect to things with Bluetooth. If I connect it to my iPhone, is it going to use my 3G? Is my phone bill going to skyrocket? This laptop was given to me so I never even knew you could connect a laptop to a phone, so any kind of info would be appreciated!
Thanks

Added (1). I'd use it for internet access.

What are the random pictures on my instagram?

Okay so on my iphone, the instagram app has all these random pictures of other people that I don't know that are on the star looking screen- I was wondering if that was other instagram users and that means that somebody elses instagram might have my picture on there sometimes. If this is the case, is there a way I can make mine not be up there? Also, while I'm at it, I keep getting texts from friends with a lot of extra punctuation- i could… Get a text… That looks like… Thissssss- is there any meaning to all of that? I would say the age range of these people is probably like 22-40 and I'm 27 myself so I was thinking it might be one of those things the whole world knows about except for me haha.

How to unjailbreak an iphone?

I want to unjailbreak a friend of mines phone, but i'm not too familiar with iOS.

Will factory restoring from the settings app do that? Or do i need to connect to itunes?