Multiple bluetooth connection
I was searching a way to connect 4 devices with bluetooth and I found the following.
http://groups.google.com/group/android-developers/browse_thread/thread/69d7810f6ef9bb7d
I'm not sure that this is what you want.
But in order to connect more than 2 devices using bluetooth you have to create a different UUID for each device you want to connect.
Follow the link to see code examples and a better explanation.
You can try my lib for multiple bluetooth connection :
Have you looked into the BluetoothAdapter Android class? You set up one device as a server and the other as a client. It may be possible (although I haven't looked into it myself) to connect multiple clients to the server.
I have had success connecting a BlueTooth audio device to a phone while it also had this BluetoothAdapter connection to another phone, but I haven't tried with three phones. At least this tells me that the Bluetooth radio can tolerate multiple simultaneous connections :)