Hi Cor,
it's not possible on direct way, because Zigbee and Bluetooth are different.
You can use a way from your phone to a Bluetoothmodule (e.g. Bt-222) over a microcontroller (e.g. Atmel) to a Zigbeemodule.
At the phone you can use the Serial-Lib an the microcontroller translate incoming Messages to the Zigbeemodule.