How to fix iPhone restoring problems?

Like an idiot, I jailbroke my iPhone 4 running iOS 4.2.1 as soon as the tethered jailbreak came out (redsn0w) and it started having problems with the iPhone rebooting sometimes out of nowhere. I got annoyed so I thought to do a restore. but the problem...

I am looking to buy the new iphone 4. However, the fact that there are problems is putting me off the idea so im thinking to keep my current iphone for a bit longer. I want the new one but am a bit worried that i will have problems. Will they fix the...

I don't really think its likely my iPhone was actually hacked but just in case, would restoring the iPhone to factory settings fix that? Thanks for any help :)

But heres the thing that i need help form you guys . If i restore my iphone.. what happens to all my data in the phone.. would it all be deleted too ? thats the thing that i need to make sure off. .. thx guys.. and could u help me and advice me if its...

I want to buy an iphone5. I heard the were some problems with iphone5 like how the paint easily comes off etc. I was wondering do they fix problems like that in later batches?

So I dropped my iphone, the screen cracked, it stopped working. I got in touch with a local repair boy, who fixed my screen but couldn't figure out why it wasn't working. So I got online and found out that it was in recovery mode. I restored it and now...

So this has been happening for a long time now. So when I tried to update my phone today from iOS 5.1 to 5.1.1 it said it is not eligible for the requested build.I have an iPhone 4S and whenever I try to update or restore it wont work, that message will...