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Android phones can vary widely, so suggestions here are intended to guide exploration rather than provide the exact steps for any individual device.
1) Forget the eduroam network
- Tap into the Settings app
- Tap into WiFi settings
- Look for a way to view known/saved networks. This may be in a 3-dot menu, it may be in an "advanced" menu in your WiFi settings, or it maybe be available if you click into Wi-Fi and then Saved Networks
- Scroll through until you find eduroam
- tap into the eduroam network and "Forget" it
2) Remove the eduroam certificate
- Open the Google Play Store
- Search for eduroam CAT
- Unistall the eduroam CAT app
3) Reset network Settings
4) Reinstall eduroam and re-join the network
Depending on your device, one or the other of these options may work better for you: