The app takes the tower ID and then checks our database for the tower location. To check our database, an active data connection is needed — this can be a 2G/3G/4G or Wifi connection. If you have a connection and the tower location is still unknown, then that tower must not be in our database.
Our tower database is made up from a few different sources, but is not complete. This is especially true of newer towers like recent 3G/4G towers. The database is constantly being updated, and so new towers are being added all the time.