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iPhone common terms explanation

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In this video, we mainly explain the network lock and card sticker

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Network lock means that the operator locks its customized iPhone in the operator's network,

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so that the iPhone can only use the SIM card specified by the operator

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If the SIM card is replaced,

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it will display that the SIM card is invalid,

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or the network function cannot be used

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The current picture shows that the SIM card is invalid,

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but its signal will show

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This is a network lock

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Generally, foreign iPhones have network locks

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Let's take a look at the status of the iPhone with network lock

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When we insert the SIM card, it will display the hello activation interface

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Although the signal can be displayed,

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we can't access the desktop, and this phone cannot be used

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Card sticker

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The card sticker is a kind of electroplating film

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that can be attached to the surface of the iPhone card

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Card stickers can use Apple's system bug to crack the operator's network lock,

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so as to realize the function of making and receiving calls

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The size of the card sticker is the same as the size of the SIM card,

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and it is installed under the SIM card

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These are several shapes of card stickers

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There will be chips on the card sticker in the early days

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In the later production, the chips are BGA chips with no pins visible,

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and they are very thin

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They are soldered in the middle of the card sticker

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When installing this kind of card sticker, it is easy to break the chip,

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causing loss of functionality

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Some unscrupulous merchants will install the card sticker inside the iPhone mainboard,

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so that we can't tell the difference in appearance

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Next, let's take a look at the built-in card sticker in real object

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After disassembling the iPhone with the built-in card sticker,

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we can see that the SIM card slot has traces of welding

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On the surface, if we look at it, we can't see it at all

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From the side, we can see a small chip

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This chip is the decryption chip on the card sticker

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It is soldered to the mainboard through the cable,

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and it is almost invisible from the outside

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Ok, this the introduction of network lock and card sticker