determine the status of the terminal.
If there is no connection, the prompt terminal cannot
be connected temporarily or is not in the service area.
The area where the terminal is located may not cover
the GSM signal or the signal is weak in the basement.
Please drive to the area where there is a signal to use.
If not connected, it indicates that the terminal balance
is insufficient or the machine is stopped. Terminal SIM
card is overdue, please recharge this SIM card.
If there is a connection and hear "toot... Du.... Du...."
When the sound.
The terminal SIM card is installed correctly and has
balance, please consult the operator of this card to
open GPRS function; You can also use the mobile
phone in the browser input you commonly used url,
see whether can open the web page; If you can't
open it, you don't have GPRS service. Please contact
the operator to open it for you.
If there is no connection, the prompt terminal cannot
be connected temporarily or is not in the service area.
The area where the terminal is located may not cover
the GSM signal or the signal is weak in the basement.
Please drive to the area where there is a signal to use.
If not connected, it indicates that the terminal balance
