Communicating between two smartphones without using a Cellular Tower - Peer to Peer

Lets say I have 2 mobile phones which are 50 meters away from each other and I would like to send a very small packet of data from mob开发者_StackOverflowile-A to mobile-B, without using any communication to cellular tower.

To make it simpler, I would like to build an app which implements a Peer to Peer connection for 2 mobiles in the same radius (in the same area).

Is this feasible using the technology of smartphones these days? (Android for example)

No. The radio services the mobile networks are licensed under vary by country, but none that I know of allows for that kind of ad-hoc communication.

50 meters would be a stretch for WiFi, especially in a pair of handsets with less-than-ideal antennas. Bluetooth would also be right out.

Bluetooth is your best bet, but even in an open field 50 meters would be too far apart.