Details：
When using this phone to make a call, you need to place the phone card in a special card sleeve, and then insert the card sleeve into the phone card slot. After the signal is detected, you can make a call. It is mainly suitable for areas where mobile phones are not allowed. Support lock network lock card.
Details：
When using this phone to make a call, you need to place the phone card in a special card sleeve, and then insert the card sleeve into the phone card slot. After the signal is detected, you can make a call. It is mainly suitable for areas where mobile phones are not allowed. Support lock network lock card.
Details：
The phone has a built-in mobile phone card, and the user holds a valid card and inserts the card to make a call. Support 4 groups of family numbers; support 13.56M radio frequency card, ID card, CPU card, IC card; support network lock, lock operator, encryption card function, prevent illegal card use.
Details：
The phone has a built-in mobile phone card (China Unicom/Mobile supports 2G, 3G, 4G, and Telecom supports 4G and requires volte activation). Write the validity period and family number on the card issuing software to enable free family calls within the validity period of the card.
