Mobile phone IP's are generally dynamic (meaning it changes over time and on intervals whenever you connect). Once you no longer access the site and go to a different location, that change should not be logged into that website UNTIL you access that site yet again.
Usually site location trackers are just to gauge demographics / analytics as to which geographic location accesses the site most. Unless the intent of the site is to actually track you, that should involve CHECKING what your mobile phone sends as part of its requests to the site (which is leaked through the HEADER information of each requests, and can log which mobile phone are actually using). If you're the only one with, let's say a Nokia phone that accesses that site and it does record the header information of each requests your phone makes, then there's a possibility that yes, your frequent or actual location can be tracked as that particular device is pinpointed to only you.