iPhones have the original network providers lock status stored on Apple’s systems, this means if you purchase a network unlock via a shop or website that doesn’t have the correct contacts or procedures in place to unlock an iPhone, it will unfortunately cost you more money down the line. Usually this will affect you when you connect your iPhone to iTunes for an update or when Apple release a new iOS update, this will cause the iPhone to lock again to the original network leaving you with an iPhone that needs unlocked again costing you more money and a period with an unusable iPhone.
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