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GrapheneOS patches an Android VPN bypass that Google decided to leave alone
(www.techradar.com)
This is a most excellent place for technology news and articles.
Signal, and its improved client app, Molly, works great on Graphene without any issues.
Honestly all my apps worked, even my banking app. I had one weird case where an unpopular app did not work, but I had contacted the Devs of that app, and it soon got resolved -- I'm not sure if I helped.
So now, all my apps work without any issues.