If you use the 'shock' function it is that sensitive that if someone opens/closes the car door it can send you a text.
It can be a bit annoying after a bit but great if you have to leave your tackle somewhere else.
If you send a text to the tracker ... shock123456 it switches the function on, noshock123456 turns it off again
If you use the app it gives you the location details at any moment in time. Once the location search refreshes it will show you where you are in relation to the tracker.
You can also track it's movements, speeds, stop-overs etc via the app and it will save historical movements.
If you text a command to the tracker it will text you back with a confirmation.
Likewise if you activate the shock sensor, or the battery runs low, you will receive a text.
I haven't taken the Sim out in all the time I've had it