content: Its already been done, have a look! https://secupwn.github.io/Android-IMSI-Catcher-Detector Also worth noting, OpenSignal isnt actually an open project, as the name might lead you to beleive.  I'd recommend contributing to OpenCellID instead. The data you upload to OpenCellID is made avalable to the public under the CC-BY-SA license. This benifits a lot of other projects, including the app I linked above.