What has happened to my iphone?

Okay, so I got an iphone 3gs, and wasn't told it had been jailbroken and restored, now when we have tried to jailbreak it, it has stopped working, its just hit the apple logo and thats as far as it will go. We didn't jailbreak it to get free things, we just wanted to unlock the phone to any network.

Can any body give me some ideas on what to do?

Your so unfortunate. Why don't buy the new iphone 5. That would be better.

Hmm. That's difficult… I mainly only have experience with iPod touch but I'll give it my best. So I'm guessing that you've bought the iPhone second hand. I'm also assuming that you have tried resetting it. But that would also be difficult regarding that it won't turn on. I'm really sorry, but there's only so much I know and it's all from my experiences. I have had this problem before though. You may need to take it into a shop such as JB HIFI or other technological stores. But the Apple store would be the last resort. What did you jailbreak it with? That's the big question. I can only help until that is answered.

I think you have messed up with your phone. Go to a nearby mobile store and solve the problem. No other go.
If you need to unlock your iPhone, you could have tried unlocking through remote unlocking method. This method of unlocking is safe, simple and affordable. You need not jailbreak your iPhone to unlock through this method. You can get the remote unlocking for an iPhone 3GS from http://www.unlocking4u.com/apple-iphone-3gs/rs6wp9/ with easy unlocking instructions.

Don't worry same thing happened to my brothers phone I don't know how he fixed it because I'm not a tech nerd like him but you can go on youtube and type in iPhone 3gs stuck on apple logo and there are plenty of videos that will help you fix your phone.