An iPhone 4 which has been officially unlocked by Apple is called a factory unlocked iPhone 4. Such an iPhone 4 is pemanently unlocked. You can use it as a phone anywhere there is a carrier that supports GSM or UMTS/HSDPA 3G format with any SIM-card. You don’t need to unlock your iPhone whenever its software get updated. The IMEI number of that iPhone has been registered and marked as unlocked in Apple’s database. Hence, you can enjoy to update firmware without need to worry if your iPhone 4 will be re-locked again.
You can buy iPhone 4 factory unlocked from amazon at the best rate . Here are some of the iPhone 4 models which are factory unlocked.
Great article about iphone factory unlock. Very Informative. I just also had my unlock at Jailbreakhome.com. Very fast unlock in a very cheap price.
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