I'm in the security industry.
Tracking software can be on your cell phone and you would NEVER know it and most employers are using it now. You can't search for it, there is no icon for it. The only clue you would have is that if occasionally the phone lights up when it doesn't ring. That indicates it is transmitting data. The back light just comes on for no reason. There is no way to prevent this. Always keep your phone in view and see if it occasionally lights up when not in use.
It keeps track of everything. What number you called, how long you were on the phone, what number called you, missed calls, the actual TEXT of text messages sent and received even if they are deleted from the phone. photos and videos made with the phone and the GPS coordinates of where the phone has been. Contacts, new contacts added, things in the calendar, websites gone to..when and how long the phone was turned off...Spouses buy the software to spy on cheating spouses all the time.... and they never know it's there until they get served with divorce papers. There are other kinds that transmit the data via text message but it leave the message in the sent box and easily caught if they clear the sent box. I don't recommend that software to clients.
An employer has every right to track you on their own equipment. That is why they are issuing phones instead of reimbursing for them. They can also put GPS on the car if they own it. All the more reason to take the monthly reimbursement instead of the company car. It is illegal to GPS a car that you don't own. Technically, they are GPS's their PHONE and their car and not you personally, so it's legal. It is even illegal for a PI to put GPS on your car, only the police can GPS a car and a cop won't GPS a car to see if you are not working.
Take care, someone is watching.