I only want to jailbreak it so I can get apps like in the app store and download stuff like that. I dont want to unlock it to get T-mobile service. I know you lose 3g speed if you use T-mobile service. So I was wondering if the same thing happens if you jailbreak it. Could jailbreaking an iPhone 3G affect the 3G speed of the iPhone? I would really appreciate your opinion regarding this. Thanks.