I have 3 of these trackers.
Call them from a smartphone and they text back a link that opens in Google Maps, very user friendly.
The tracker comes with panic button, door switch connectivity, ignition cut off, remote control....... but all I did was chop off all the wires apart from the read and black power wires.
I use O2 payg SIMs, linked on the O2 website to my credit card so they automatically top up so no worries about running out of credit. I give them all a call once every month to make sure O2 are happy that they are active SIMs otherwise they may cancel them.
I really rate them, I have 7 other vehicles with constant tracking accessed vis a web portal, but they are £14 a month each, so for security tracking the cheapo one is a better deal.