Pokémon Go doesn't work on data
I saw a few questions like these. I did a lot of research myself to see how I could fix the problem, and this trick did it, so I thought I'd add my two cents, and so this can also help future readers.
Why is Pokemon Go not Working on WiFi?
At the first launch of the app, a setting must have been selected automatically that restricts data access to the Pokemon go app.
How to fix the problem
Go to:
- Settings of the phone
- Go to the apps section of your settings
- Click on "reset app preferences" in that section (for my Galaxy S7 I click the three dots at the top right of the screen first)
- Launch Pokemon Go
More on resetting app preferences in this article by TechRepublic.
Downfalls
This will reset the app preferences for every app, which means that when you launch an app, it will again ask you a prompt for access to a certain feature on your phone. For example, Gallery will ask for permission to your photos the next time you open it, just like Pokemon Go will ask for permission to your camera.