The default Boinc for Android only allows three account managers and doesn’t allow the addition of custom managers, which is needed for Gridcoin pool mining with your Android phone. However, the Boinc app can be modified using the free Android APK Editor app, which is what I used to insert the pool.gridcoin.co URL in the default manager options.
If you don’t want to do the setup yourself you can just download the app file here: http://www.filedropper.com/gen_1
Source: Modifying the Boinc Android App to Work with the Gridcoin Pool Directly
