Users should have the same e-mail address and password on mobile app and on web server.
Then can login and send data to server.
If user doesn't have an account can register on mobile app or on web server.
Then can login and start sending data from mobile to server.
On Info activity users can see info of mobile(battery level, signal level, speed km/h, latitude and longitude on current location.
On Map activity users can see their current location on Google Map.