With the release of the Fallout Amazon Prime series, many fans have picked back up the Fallout games. And if you remember when Fallout 4 released, there was an app you could get for your phone called the Pipboy Companion App. You'd connect to your game save and you could use your phone as the Pipboy in game, but also use your stats outside of the game for cosplay and role playing.
Well, turns out despite Google removing the app from the Play store, you can still install and run the app on the latest version of Android. You can find it here on the Internet Archive (I installed ver. 1.2). Just be sure to enable installing apps from whatever browser you used to download the APK.
AFAIK iOS might be SOL. Perhaps someone who does can chime in with a solution (Apple might still be hosting it on the app store for all I know)