If I jailbreak my iPhone will it mess up?

If I jailbreak my iPhone will it mess up?

  • Will this mess up my iPhone? I have an iPhone 5c and my boyfriend just got an iPhone 4 and he wanted to use my iTunes stuff on his phone and I have it on my phone and iPod would he be able to use it for his phone as well or would that mess up my phone?
  • Will the beta software mess up my iPhone 4? I wanna download the beta software so I can get iOS 7 but scared it gonna mess up my iPhone 4 will it
  • Will taking your battery out you iPhone then putting the same one back in mess up you phone? My iPhone 5c was water damaged and I looked at things on YouTube how to fix it and one was to open up your iPhone and vacuum out your phone but I took out my battery and vacuumed it then put it back in.
  • Will restoring a jailbroken iphone mess it up? My iphone was already jailbroken when i got it-i upgraded it and it got stuck in dfu mode--i got it fixed--i have a 3gs by the way and the firmware is 4.1---im afraid i might mess it up again and i was wondering if restoring it through itunes will mess it up cus cydia is in it and i don't know how to take it out…