Waterproof GPS Tracker & GSM (SMS) staff with real-time location, SOS, over speed alarm & motion, perimeter security - by TKSTAR (Electronics)
First point it is explained nowhere (even if it makes sense) that must first remove the PIN code by inserting SIM in a phone. Then it must be (as is said in the doc !!) test the functions before using the product in real condition. Once this is done
