Apps that use OpenCellID API

Is it possible to get a sense of how many apps use the OpenCellID API? I am trying to assess the representativeness of the OpenCellID database in a number of African countries and it would help to have an idea of what kinds of apps are using OpenCellID. For example, are there 2G/3G phones that use OpenCellID and what would those apps be?

Many thanks… Steve Song