Makers, developers and hobbyists that are looking to remote control multiple Arduino boards may be interested in a new solution created called the Connect-PI. The Connect-PI consists of two ...

In Connecting to Intel® Edison from Android* with Bluetooth* LE (BLE) describes a way to access BT via Arduino code but additional BT shield/kit is required.

A USB host shield for the Arduino is needed to connect to an Android hand set. You’ll be able to send and receive strings via the terminal, with support for carriage return and life feed characters.