Jailbreaking:
- Crashes & instability
- Malfunctioning & safety
- Invasion of privacy
- Exposing children to age-inappropriate content
- Viruses & malware
- Inability to update software
- Cellular network impact
- Piracy of developers' applications
- Instability of developers' applications
- Increased support burden
- Developer relationships
- The Apple/iPhone brand
- Limitation on ability to innovate
Apple made it clear right here:
http://support.apple.com/kb/HT3743
If you damage your iPhone, Apple won’t fix it. Some of my friends have damaged their jailed iPhones and gotten full replacements! This is not a possibility for someone with a jailbroken iPhone. Apple will just say, “The reason it’s not working is because you hacked it.” Hacking your iPhone is not sanctioned by Apple, so whatever you do is at your own risk.
A majority of the iPhone apps on installer are absolute pointless. Also, people make a lot of apps just to prove the point that it is possible, but actually do nothing helpful for the user. I have two examples. I downloaded this one apps called cowbell… You tap on it and it makes a cowbell noise, this is self explanatory. There is also an app that lets your record videos, but only 5 seconds long. Then, the only way to get it onto your computer it to SSH into your iPhone. Trust me there are a lot more apps that do nothing helpful than apps that cool or help you get things done.
You love your iPhone and it already does everything you want it to. You just have to live for 4 months, knowing it can do so much more. It’s a great iPod, a great phone and a great internet communicator. Why should you jeopardize that?