On a typical scenario, locked phones will display a prompt if a restricted SIM card is used. It requests for the unlock code for you to be able to continue. On some new phone models running Android software system, the phone will show a message that says “SIM network unlock PIN” or sometimes “Enter Network Lock Control Key” if a network is locked. Windows phones will also display a message saying, “This SIM card can only be used on specific networks. Contact your customer service center for the unlock code”. Some handsets may also display different messages like “Enter unlocking code”, “Enter special code” and in some cases the phone will simply display a message stating the phone is locked. After a valid code is provided, the handset will display “Network unlock successful” or “Network unlocked”.
For Apple iPhone users, certain unlocking companies introduce different types of unlocking methods such as generating unique codes through a manual code generator. The most practical way of unlocking is through online services. This has been proven by one of the cheapest unlocking service offered online – the unlockiphonevip.com.
Apple iPhone’s complex locking security
Gizmodo publications reported confirmation of a technique to bypass SIM lock for iPhones on August 14, 2007, permitting the phone to function freely with different carriers than AT&T. The scheme requires the use of Turbo SIM card ( which is costing US$80) basically tricks the iPhone into trusting that it is still functioning on the AT&T network when in fact it is natively connected (not in a roaming mode) to a different carrier.
Later on, Australian Personal Computer published a ten-step guide on how to unlock your iPhone handsets using the Turbo SIM method.
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Most handsets have security measures built into their firmware that protects them unlocking. This made it difficult for the subscribers to manually unlock their handsets. And if they attempt to do so, this may result to a state where in the phone will display a security message and that the phone needs service.
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Unlock Iphone Facts 