We update new function & firmware software for CCTR-811, very useful function like: APN & GPRS auto download and configure by different SIM card in the tracker, SIM card money balance check by SMS, CELL ID locate without GPS signal, air upgrade tracker firmware software by GPRS (Sending SMS to trigger upgrade automatically), A-GPS fast first locate, all these new functions are useful, the new CCTR-811 will put to mass production very soon, welcome to test this new device.