Mode of use
It is only necessary for users to go to the business hall to get a mobile phone card, insert the mobile phone card into the card, insert the CTO into the telephone card, lift the microphone, enter the number to dial, and dial it according to the OK key. (please confirm the direction of card insertion and insert the chip upward.)

Telephone application
Stations, campuses, docks, airports, scenic spots, squares, shopping malls, community properties, municipal engineering, regulatory complaints, convenient services, hospitals, vehicle management offices and other places.

Highlights of telephone function
√ external card, supporting hot plug.
√ China Unicom / China Mobile supports 2G, 3G and 4G, while China Telecom supports 4G and needs to open volte.
√ adjustable functions inside the phone: volume setting, display setting, disable time, no dialing number, maximum call duration, network lock and card lock, password setting