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What’s different between iPhone unlock and iPhone jailbreak?
"There’s actually a significant difference between an iPhone jailbreak and unlock. The jailbreak deals with the softwares and apps on the iPhone, while unlocking the phone lets users use other wireless networks (SIM) on the phone.
Jailbreaking usually pertains to softwares and apps on the iPhone / any other phone which you jailbreak. By jailbreaking, you can actually run softwares and apps that are usually not allowed to run. You can install these apps because the jailbreak affects the firmware of the iPhone or the iDevice. This lets you install apps that are not on the App Store. This means, lots of control and freedom over what you download and what you install in your iPhone.
Jailbreak lets you modify the resources on your iPhone. That way, you get to install softwares like Cydia which provide thousands of free and jailbroken apps that can be installed on the iPhone. The jailbreak actually is best for installing apps which are not approved by Apple. This is called unsigned code. These apps might also let you modify certain settings on the hardware like for instance, iPhone 3GS video recording, and even unlocking the phone.
2. UnlockingUnlocking is a totally different thing. It has a sole purpose – to let you use different carriers (SIM or network providers) on your iPhone. Technically, the iPhone can be run either on AT&T or on Verizon and that is dependent on which provider you go with. However, if you want to use the iPhone on any other service provider, you cannot do that without unlocking your phone. This applies to all mobile phones actually. Unlocking a phone is either through software or through hardware change. While meddling with the hardware might be risky, software unlock is most-followed method, especially in the case of iPhone.
Jailbreak and unlock have been declared legal to a large extent of late. This however does not mean the user policy of the providers have changed. It only means you cannot be sued for unlocking or jailbreaking a phone anymore. It just means you lose the warranty or support through jailbreak and unlock.+"