Wholesale Card Factory Plastic Prepaid Scratch Phone Card with Pin Code

Product description

SIM card is called "user identification card". It is actually a smart card containing large-scale integrated circuits, which is used to register important data and information of users. The most important function of SIM card is authentication and encryption. When a user moves to a new area to make or receive a call, the switch must authenticate the user to determine whether it is a legal user.


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Company profile

GREESO TECHNOLOGY (SHENZHEN)CO., LTD.

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