You can wire up something like an HC-05 module (https://www.ebay.co.uk/itm/125085159709) and then connect to the Pico via Bluetooth UART connection. This is a bunch of info on doing it with the original Espruino board which even had a space on it: http://www.espruino.com/Bluetooth
However I'd strongly suggest that you look at one of the Espruino devices (like MDBT42 Breakout - http://www.espruino.com/MDBT42Q) that has bluetooth already on it - that would be so much easier to use. More compact, and it'd use a lot less power too
Thanks for the response. Can you help me with the sample code on how to transfer data from pico to smartphone?
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