Our products This product is a global GPS positioling terminal, usually used in vehicle, personnel, pet positioning and anti-lost etc.
GPS Tracker Model: GF-21
Communication Method: GPS/BDS/WIFI/LBS
Battery Capacity: 500mAh
Dimensions: 1.65 x 1 x 0.55 inches
Weight: 0.67 oz
Operating Temperature: -20℃ to 70℃
GSM Frequency Band: GSM 850/900/1800/1900 MHz
GPS Receiver: High-sensitivity GPS receiver

Preparation:-The device does not include SIM card,please prepare one 2G network SIM
A Speedtalk SIM card is recommended, You can buy it in stores or on Amazon.com.

Power on:-Open the card cover, insert the SIM card according to the instructions, press the button to power on, the red light flashes, and press and hold for 10 seconds to turn off. (If the indicator light does not light up after inserting the SIM card, please insert the SIM card to charge the phone. Note: Do not charge without a SIM card!)

Bind the master number:-Send SMS “000” to the locator number, and the device will reply to the SMS. Send "Settings; Binding + Master Control Number" to complete the binding.

GPRS location query:-Send SMS “777” to the locator's number. The device will reply with a geolocation and Google Maps link. Open the link on your phone to get accurate location information.

Location track query:-Send SMS “102” to the locator's number. The device will reply [Account, Password]. Log in to the app to view real-time location information.

GPS device status:-Send SMS “888” to the locator's number. The device will reply with information about main functions, battery capacity, bound number, signal strength, startup frequency, GPRS TF card capacity, etc.

Restart the host:-Send SMS “999” to the locator's number and wait for 1 minute for successful recovery.

Shut down and stop information display:-Send SMS “444” to the locator's number. The device will reply "Reset;

Notice: The SIM card is not included in the package, so you need to provide your own SIM card.

Please use a GSM standard mobile SIM card with GPRS internet functionality.A Speedtalk SIM card is recommended, You can buy it in stores or on Amazon.com.

Check that the SIM card is inserted and used correctly, ensuring the insertion and chip direction are correct.

Check if the SIM card is out of credit and if the locator is turned on. If the indicator light is on, it confirms the working status of the indicator light.

The SIM card needs a balance to connect and be used.