You may add the app to multiple phones but you can't pair multiple phones at the same time.
To pair a different phone you'll have to reset the bluetooth on the phone already paired. To do this just close the app; or disconnect the bluetooth on the paired phone; or press the pairing button on the side of the unit.
Make sure the blue light on the bottom of the drive unit is flashing.
Then either add a new device or click on the device in the app on the phone you want to pair.
