If you're asking if 2 GB is enough... Then It all depends on what you do with your phone.... If you're asking can the track the data usage on it? Of course.
+1 to what Almeuit said. I learned that connecting to home WiFi, I cut down from 6 GB to 1.3xx GB. Changing some habits also helped, like marking YouTube videos to watch later at home as opposed to on the spot.