... SMS or GPRS. Basic Operation: Insert SIM Card into GPS Tracker, use mobile phone to call this SIM number ... Vehicle for rental or manage of outside equipment, etc. //GPS tracker, Tracker Protect the elder, kid, employee and pet ... the businessmen. //GPS tracker, Tracker Manage the outworker. //GPS tracker, Tracker Covert Tracking//GPS tracker, Tracker //GPS tracker, GPS vehicle tracker, GPS car tracker, ...