USIM (UniversalSubscriberIdentityModule) refers to the user's global identification card. Compared with the traditional SIM card, the USIM card has at least three advantages:

1. More secure: The USIM card chip has a high-level encryption function, which increases the network's two-way authentication function, which makes the security and confidentiality stronger, ensures that important content such as user identity information is not easily cracked and stolen, and can better shield the pseudo. The spam message sent by the base station makes the user's personal information more secure.

2. Greater capacity: a lot of careful users get the USIM card, you will find that the chip part of the larger area. It is understood that the USIM card storage capacity has increased to 128KB, the capacity is larger, the phone book function is more powerful, up to 1000 phone numbers can be stored, and for each phone, users can also choose to enter emails, aliases, etc. Information, easy to manage contacts.

3. More convenient: USIM card is compatible with 2G/3G/4G network at the same time, mobile Internet access is more refreshing. Especially worth mentioning is that the USIM card also supports mobile applications such as NFC mobile payment. At present, the NFC-USIM card launched by Guangdong Mobile can integrate bank cards, bus and subway cards, membership cards, loyalty cards, and corporate access cards into one card. Users can have 450,000 units in Watsons, the whole family, and OK convenience stores. Use a mobile phone to complete the payment on the POS.