Suppose two people are on a plane, a few meters apart, with Android smartphones without internet access, and would like to communicate by text messages and if possible also by audio call, using Wifi or Bluetooth (both allowed on this plane).

How can this be achieved?

So far I have only been able to think of very complicated solutions, like using XMPP clients on the two phones, or Mumble clients on the two phones, setting up an XMPP server or a Mumble server on one of the phones, and communicating by Wifi, the main problem being that I haven't been able to find any XMPP or Mumble server for Android, so the only way out I have devised would be to install a Linux distro on one of the Android phones and inside of it, a standard XMPP or Mumble server. This is very heavy. Surely there must be easier solutions. Many thanks in advance.

  • Just search for Wifi direct chat.
    – Robert
    Apr 12, 2022 at 13:45
  • I remember an option with bluetoooth. I clicked on the above link and I also see "wifi bluetooth chat" in the list. If this is the one I'm thinking of, it worked real well, without requiring connection to wifi.
    – Jim Clark
    Apr 12, 2022 at 22:12

1 Answer 1


I finally found, used and enjoyed Briar, which exactly did the job for text messages and pictures (communicates over wifi or over bluetooth, in p2p fashion), though not for audio or video messages or calls.

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