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A sticker is a device that can be used to unlock a phone if it cannot be unlocked with software.
Like to be in China with Japan with SoftBank network lock the iphone 5, post a SIM card and card of China together on the phone, mobile phones boot time can authenticate, verify whether the t card, phone will read the card pastes the content in the chip, because it has verify mobile operators in chip information, so the phone will think use SoftBank card, after validation began to search the signal, and the Chinese SIM card can use. The CARDS stick to the same principle that many games consoles don't crack when they first use a boot disk.
Advantages and disadvantages of using card stickers
Due to the hardware-based "information fraud", the card has obvious advantages and will not be invalid due to the upgrade of IOS software version in general.
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