“Instructions are are difficult to read but tech support was responsive and issues resolved quickly. Basically you buy a sim card tmoble is what I use through Walmart insert and activate. Call the phone number given through activation let ring 2 times then hang up. You will receive a text message with a link to Google maps it shows where your dog is in real time ,provided your dog is with in cell signal.you can actually what your dogs move around on the map pretty cool.”