Add cellular information

[pm4rcin]

Hi, I think it could be worth to add cellular information to the app. It's implemented in SatStat application and here are the links to the implementation. 1, 2, 3

[pm4rcin]

When thinking about it I'm not really sure if it's in scope of this project. There is another one that has it implemented and is focused on that. But you should make decision if you want to have it in app. If yes then you can take a look at https://github.com/christianrowlands/android-network-survey and if not you can close the issue.