Problem with iPhone after reset?

I jailbroke my iPhone 5S but after sometime I wanted to un-jailbreak it, so I went into my phone settings and from there I did a complete reset (Erase all content and settings). After that my phone was now booting up. It showed a circle which kept on revolving, so I did a hard rest (By holding the power and home button together). After this the phone showed the apple logo and then it showed an image saying connect to iTunes. When I connected it to iTunes it was detected in recovery mode and said that I have to restore it before using it, so I did the restore but I was shown an error, namely 3004. Now I cannot do anything with my phone every time I try to restore it, it gives me the same ever. Now how can I get my phone repaired by apple?

I bought my iphone 5 from apple at Christmas and it said unlocked?

I've been on a orange sim only deal since I got it and my contract runs out this month. I want to move to 02, so will I be able to buy another sim only deal or will I need to unlock it again? I bought it unlocked so will it be now locked to Orange since I am on orange?

Im trying to decide between an android or iPhone? Help?

Ok so I am going to buy my first smartphone and need help. Ive looked at and compared the HTC One, BB Z10, IPhone 5c, and Samsung G4, and LG G2.

Trouble is, I don't know which OS to go with, and which is better for me, and what not, or which phone is the best as far as cost-effective vs. What it does.

Also how much Data do I need (moderate-light user) 2GB? (Would mostly be on wifi, which I believe doesn't use data?)

BTW I am an Electrical engineering student so learning curve not a huge issue. Just want the best bang for my buck.

How to transfer BBM contacts?

So I have a blackberry, and a iPhone 4s, I want to transfer my contacts to my iPhone 4s. Does anyone know how to?

If I install BBM on my iPhone, it would ask for my Blackberry ID?, Am I supposed to log in my blackberry ID and then all my contacts will be there, if not, do you know how?

Can't backup my iPhone to iCloud or iTunes?

Ok this might sounds confusing - I don't have enough icloud space to backup my iphone, so I want to back it up to itunes. However this is my first time connecting my iPhone to iTunes and I have the option to either 'Set up as new iPhone' or 'Restore from this backup'. My last backup was a month ago and If I choose the second option i'm afraid all my data (photo's etc) from the last month. I can't back it up because I have no iCloud space, which is the reason i'm doing all this. Help me please!

Will iPhone 4 keep recording video if it automatically goes off?

I want to use my iPhone 4 as a dash camera. My question is, do I need to set it so that the backlight doesn't come on, that is, so that it doesn't turn off automatically?
In other words, will my phone keep recording video if it turns off automatically?