I want to jailbreak my Iphone 3g, but the screen is cracked and I want to get it repaired. I won't be able to get it repaired, however for at least 3 weeks. My question is, if i jailbreak it, will they know, and void my warranty? Or do they just repair the screen without even turning on the phone? I'd prefer to not have to wait three weeks to jailbreak my phone.