What happen when you jailbreak a iPhone?

I just bought a iPhone 3G and I want Facebook and other apps but it doesn't work if I jailbreak it will the iOS be open to download? If it doesn't could you recommend some good apps for iPhone 3G?

Usually you can go it 1-2-3, If it is new and you have iOS 6 or higher it is really hard to do. But If you can get it down, you will get a second app download center which you can download all the apps you want at no cost. Check out -> http://greenpois0n.com/ for more information.

If you jailbreak it you can still have all the apps you usually would get, but you also get cool themes and free apps, the downside is that if your iPhone breaks and apple find out you've jailbroken it the warranty will be voided so won't be repaired for free

Jailbreaking basically allows you to fully customize every aspect of you iPhone.
The phone will still work perfectly after jailbreaking. But since your phone is pretty freaking old (iPhone 3G). You'll be restricted to many tweaks and apps because your firmware is too old and weak.
I recommend upgrading to at least a iPhone 4 or greater.

If you jailbreak, your phone goes significantly slower and you have to start worrying about viruses and other security exploits. Oh, but you get to change the colour of your text message bubbles. That's a plus.

Also, it voids your warranty.

  • Why does this happen when i try to jailbreak my iphone? When ever i try to jail break my Iphone 4 something comes up and says Failed to decrypt kernal, how do i fix this so it can work?
  • When you jailbreak your iphone is this supposed to happen? When you jailbreak your iphone are all your apps, messages icon, phone icon, etc supposed to disappear? That's what happened when I jailbroke mine but I restored it with iTunes so it's back to normal now. I'm just wondering if that was normal? Because I do want mine jailbroken but I don't want that to happen again
  • What would happen if I jailbreak my iPhone? My iPhone is unlocked through a chip with the sim card, I want to jailbreak my phone but I don't know if there are anything that would make me concerned about it. Like could it make the chip not compatible?
  • What will happen to my jailbreak if I update my iphone 5? So my iphone 5 just notified me saying that the new update is avalible. I always get the update cause I want to be up to date… Anyways I have my phone jailbroken. What will the update do? Will it harm my phone? Or just take off the jailbreak.