Just type this into the googles: How accurate is cell phone location data.
"By using cell tower triangulation (3 towers), it is possible to determine a phone location to within an area of about ¾ square mile."
Whatever you do people, stop using your phone to navigate through the city!
Worse, that quote is from the FCC. Google's just serving that up as the result of the search query.
Source: did what you said to do. Other responses include "30 meters" and "3 meters" or even "up to several miles" from different sources in the results.
Edit: I guess you're "technically" right (the best kind!) because Google is the one spreading around all those wildly different numbers in the first place.