Originally Posted by KXIX
I was recently told that there is an app that tracks any phone using the mobile number.
Apparently you dont need it installed on the phone your tracking all you need is to know their mobile phone number.
I'd be very very careful with apps advertized having this feature.
In theory, the mobile provider can track your phone, because they issued the SIM and phone number to you. But the providers don't supply this information to anyone but law enforcement/NSA/other three letter agency. Imagine the stalking possibilities...
Why I'd be very careful (as in: not downloading and installing at all...) about this is, that I've seen websites advertizing this service, and when you enter a phone number, you're asked to download and run an exe file. It probably won't work but infect your computer with malware.
I doubt it's any different with android apps.
If you install a tracking app on your phone yourself that reports to somewhere (e.g. google device tracking, "lost my iphone"), that's a whole different situation - you're voluntary giving your position to someone to keep, and that's sensor data acquired from your phone.