To troubleshoot the Nice G.O. app not functioning on both you and your wife's phones, follow these detailed steps:

1. Check Internet Connection: Ensure that both devices have a stable internet connection. You can test this by opening another app or browsing the web.

2. Update the App: Go to the Google Play Store, search for the Nice G.O. app, and check if there is an update available. If so, install the update.

3. Clear Cache and Data:
- Go to the Settings on your Android phone.
- Select Apps or Application Manager.
- Find and tap on Nice G.O..
- Select Storage and then tap on Clear Cache.
- After that, tap on Clear Data to reset the app. Note that this might log you out and erase any saved preferences.

4. Reinstall the App: If clearing the cache and data does not resolve the issue, uninstall the app completely:
- Go back to the Settings -> Apps.
- Tap on Nice G.O. and select Uninstall.
- Reboot your phone.
- After rebooting, go to the Play Store, search for the Nice G.O. app, and reinstall it.

5. Check for Device Compatibility: Ensure that both phones meet the app’s requirements. According to some information, if an app states it’s not compatible, it may mean that specific hardware or software standards aren't met - learn more.

6. Permission Settings: Check if the app has the necessary permissions:
- Go to Settings -> Apps -> Nice G.O..
- Tap on Permissions and ensure all required permissions are granted (like GPS, storage, etc.).

7. Account Login Issues: If you are using the same account on both devices, there may be a restriction. Some apps don't support logging into the same account on multiple devices at the same time - learn more.

8. Contact Support: Finally, if none of the above steps work, consider reaching out to Nice G.O. customer support for further assistance. Information regarding contact might be found in the app or on their official website.

By following these steps, you should be able to resolve the issues with the Nice G.O. app on both your and your wife's phones. If problems persist, further technical support may be necessary.