The cellular phone system is not the same as GPS, which still confuses many people. The accuracies of each system, however, have been honed dramatically, such that, if you're transponding as a well-behaved player within the system, latching onto your moving signal will be easy.
HF
The way they can get you by triangulation is concerning...I wish there was a way you could isolate and use only one, a single tower (cell) so that even though only one is actually used for data and voice, the triangulation from two or more towers in your immediate vacinity and not allow more than one tower to give you the service you need...
Or the ability to track you, effectively enough, through multiple sensors...
There may be a way to still locate you with one “cell”...It may give you a bearing, and to range you from that sensor, you could calculate the signal strength and bearing shift to determine the range along the signal bearing (direction)...
But if I talk too much more, I am afraid some “bubbleheads” ;-) are going to tell me to shoosh...