Whether you have an unlimited data plan or you're interested in carefully monitoring the mobile data you use, Android users have plenty of options when it comes to tools that keep track of their mobile data usage. Some carriers pre-load their own apps, but if you're looking for a better one, you can't go wrong with Onavo Count. Its widgets, support for 3G and 4G devices, and per-app display makes it the most useful app in the category. More »