Details：
Circular-to-curve-audio interface

Details：
Circular-to-curve-USB interface

Details：
Circular-to-curve-4Pin interface

Details：
Square-metal hose-with adapter-audio interface

Details：
Square-Metal Hose-with Adapter-USB Interface

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.