bridge from wireless mesh network to mobile device over bluetooth or wifi
I don't think you will find something COTS that specific.

However check these guys out: Hybrid bluetooth zigbee mesh networks:

http://www.libelium.com/libeliumworld/articles/101321320500

And this product does most of what you need, except fit in your pocket:

http://www.libelium.com/products/meshlium

If you were to make a custom board, and Arduino, Bluetooth shield and Zigbee shield together would make a simple bridge.