Is jailbreaking for your iPhone bad?

My friend says he wants to jailbreak my phone, but i don't know if I should do it, is it ok if I do?

What do you want to do with it after it's jailbroken? If there's nothing you want to do that a un-jailbroken iPhone can't do, then it's a waste of time… It doesn't break the phone, you can always restore it, then it's just a pain in the but to keep up to date if there's nothing you want to do…

No, it mainly make your iPhone more easy and super efficient, and you can add more themes for your iPhone whatever you want

Slakker is wrong. You can't always restore it. When either rooting an android or jailbreaking an iphone, there's the CHANCE that you permanently mess up the phone, and restoring it will do no good to it all. Even if you have insurance, companies refuse to fix and or replace phones that have been jailbroken, because at that point it is out of their hands and not in their contract to do so.

No jailbreak is cool and you get free stuff.