Information in the section applies to the device UniPing server solution v3/SMS with a built-in GSM modem.
There is a need to go to the page «SMS» of a device web interface to know a balance on the SIM card installed into the SIM slot of a device: In the section «GSM SETUP», specify a USSD code of a corresponding service provider to request a balance. USSD Command for request of GSM account status – is a command sending a USSD to request a balance. In the section «GSM ACCOUNT», click the button «Send USSD Request». In a few seconds, the information about a balance on the SIM card will appear in the field «Reply to the USSD Command of status request».