Just like the title. I want to jailbreak my iPhone 4, but can jailbreaking cause things to stop working permanently (like the issue some people had with wifi after using ZiPhone years ago)? I'm talking about stuff that happens to the phone during the jailbreak process that could potentially harm the phone and never go back to normal (even after a restore)? People's wifi was permanently borked after that ZiPhone incident. Please assure me that nothing bad can happen.