hypnotism chuck on Nostr: GrapheneOS devs claim when airplane mode is on, all the radios on the device are ...

GrapheneOS devs claim when airplane mode is on, all the radios on the device are dead. People make use of this to try to stay as anonymous as possible by only connecting through Tor and WiFi spots. I would imagine this should apply to all Android devices, but I wouldn't count on it with an extreme threat model... Recommend researching yourself on a device an OS basis. The baseband rabbit hole is quite wild.

SimpleX uses a relay server model with no metadata including user identifiers. Self-hosting is possible, but not necessarily beneficial for privacy imo. Tor is well supported. Read the website, it's all pretty well explained there.

The app does still need some polish for mainstream appeal though, but it's getting there... Beating the network effect will of course be the biggest hurdle, but it's the messenger with the most potential for such that I've seen so far.