Before you think about jailbreaking your device, please read this:
http://en.wikipedia.org/wiki/Jailbreak_(iPhone_OS)
Esp. the parts about "Viruses/worms" and "USA Legal issues" (it's not quite up to date with the new jailbreak method, naturally). It is not sure that Apple doesn't know that you did jailbreak even after a iTunes restore! I personally believe that they know it.
Apple Support: Unauthorized modification of iPhone OS has been a major source of instability, disruption of services, and other issues—MacRumors user and jailbreaker bruinsme calls it: "HEED to Apple's warnings, you jailbreaking thieving criminals"
http://en.wikipedia.org/wiki/Jailbreak_(iPhone_OS)
Esp. the parts about "Viruses/worms" and "USA Legal issues" (it's not quite up to date with the new jailbreak method, naturally). It is not sure that Apple doesn't know that you did jailbreak even after a iTunes restore! I personally believe that they know it.
Apple Support: Unauthorized modification of iPhone OS has been a major source of instability, disruption of services, and other issues—MacRumors user and jailbreaker bruinsme calls it: "HEED to Apple's warnings, you jailbreaking thieving criminals"