When playing the game with both mobile networks and Wi-Fi enabled, the download may appear to stop at 0% or 99%.
 
You may turn off mobile networks and only connect via Wi-Fi.
  1. Open your device settings
  2. Locate Mobile Networks
  3. Tap Data Usage
  4. Tap Mobile Data
  5. Turn off Mobile Data usage
 
Downloading via mobile networks may result in additional charges depending on your payment plan.