BitChat is a peer-to-peer messenger that works entirely offline using Bluetooth and mesh networking. No servers, SIM cards, or internet required. Whether you’re preparing for emergencies, attending protests, or just want a censorship-resistant way to connect, BitChat keeps you talking when everything else goes dark.

Ben from nostr:nprofile1qqspnzgrfett3asxcuj0gksje6z2zxzpvgd27uvz58m9vsuqh8zzw6cpr9mhxue69uhhqun9d45h2mfwwpexjmtpdshxuet59uq3kamnwvaz7tmxv4jkguewdehhxarj9e3xzmny9a6x7mne7t0fl3 did a great tutorial on how to use it:

https://youtu.be/WfzcKAzgB9s?si=Jw9mEff4YZbORs3D