This was at the school I work at, we have tracking software embedded in all the laptops and a tracking program, it tells us the external and internal IP, as well as the user that logged on.Then the cops may have a deal with Comcast (probably still took a judges sig). If someone stole your laptop how did you get their addy? How did you know it was yours? Did you have some sort of phone home software?
Whoever your ISP provider is, in this case a cell provider, has a record of who uses what IP and when. So even if those so called free tracking programs say you are someplace you are not, your provider will know for sure who had it.I can be tracked. I use no proxies. But if I gave my addy to you, it would show the provider is in a southern state and I am not.
I use a cell phone for my internet access.