If i jailbreak my iphone, is there a chance it will ruin my iphone or cause trouble?

I want to jailbreak my iphone so i can get the best of my money. I have the iphone 4 and i was wondering if i jailbreak it, if there's any chance it will ruin my iphone or cause any trouble?

Yes it could cause many problems and can ruin your iPhone! But in most cases it won't if you do it properly! Mine is jailbroken and I hav no problems! In some cases it causes iPhone to slow down its speed and sometimes it can mess up if you download the wrong stuff on Cydia!

I have an iPhone 4 and when I jailbeaked it, it caused alot of trouble. Usually jailbreaking your phone causes trouble but doesn't ruin it.