Comms
Between two phones, a few doors: light (a code), a tap (NFC), sound, or straight across the net. Pick one; the rest is automatic.
By air
Send your camera to a neighbour, phone to phone. Pair once.
Open the stream
Keep
Share your contact as a code; add a neighbour's; call them direct.
Open people
Send
A note, a link, a name, or a Wi-Fi key — by light, a tap, or sound.
Open messages
Watch
Phones as a camera system: a low-res grid, a call for the full stream.
Open security