Before iPhone 4 is being distributed, it is locked by the manufacturer Apple. Many terms are used to describe the unlocking of iPhone such as jailbreaking, jailbreak or unshackling.

Jailbreak refers to unlocking iPhone so that you can use your own ringtones. If you jailbreak your iPhone, you don’t have to use the standard ringtone maker. Instead, you can create unique ringtones. The ringtone maker in your iPhone only allows you to use ringtones that are purchased from the iTuneStore.

With a locked iPhone, you won’t be able to install third party software or use Sim card to make phone call.  Unlocking iPhone allows you to use other types of network to make phone calls. The charges of the AT & T network are usually higher than the simcard. Hence, many people prefer to use Simcard to make phone calls.  In order to unlock the iPhone 4, you have to make modifications to the firmware. All the methods used to unlock iPhone will void your warranty.

The warranty becomes void because you made modifications to the system of the iPhone. Riskier methods that are used to unlock iPhone 4 involves the modifications of the radio firmware of the iPhone. It is recommended that you don’t unlock the iPhone yourself if you don’t have the knowledge. If you attempt to unlock the iPhone 4 incorrectly, the system will become damaged. The best solution is to use an online service that can unlock iPhone 4. The online unlock iPhone 4 service will offer the instructions and necessary tools for unlocking the iPhone.

When you sign up with the service, you will be given a set of instructions on how to unlock your iPhone. Some iPhone 4 unlock service offers membership access to bonus features such as free movies, music, games and app. Normally, this kind of membership site only requires you to pay a single membership fee. If it requires you to pay a monthly membership fee, it is not well worth your money because there are other types of sites that would offer free lifetime access.

Before buying an iPhone unlock solution, make sure it will completely unlock your phone. In this way, your iPhone will be able to work with any Simcard and phone carrier. It should not cause your iPhone to lose any feature of function or 3G function. It should allow you to use the SMS/MMS and instant messengers. Besides, it should offer 100% satisfaction guaranteed. Normally, the same unlocking solution can be used on other iPhone models including 2G, 3G, 3GS and 4G. It is important to read reviews before signing up for the iPhone unlock membership. In this way, you will be able to ensure that it does not suffer from any signal loss or problems in 3G after the iPhone is unlocked.

Apple had released the latest iPhone firmware version. Many people were affected by the firmware. Their iPhone was relocked by the firmware 3.1.2 because of using an iPhone unlock solution to unlock it.

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