The iPhone/iPod 3.0 OS allows third-party applications to utilize the device’s Bluetooth capabilities for two-player games. The first (and only) application I had that supported this in an update was Flight Control, and since then, whenever my wife and I are on a train, we occupy our time playing this.
The huge advantage of multiplayer Bluetooth compared with Wi-Fi is that you just need the two devices, no Wi-Fi access points or Internet connectivity is required. This is truly awesome, although as we cry, “Arrrgh sooo close!” loudly on public transport we can get some strange looks. We’ve loved playing Flight Control, but I thought that by now there must be a good number of other Bluetooth-enabled games. So I’ve searched the App Store and found the following games are the only ones that support multiplayer gameplay over Bluetooth. This list will hopefully grow soon with more complex quality titles.
Check out what I found at The Apple Blog