WizBit is a BitTorrent client for Symbian S60 smartphones (such as the Nokia 6680, 7610, 6600, N70, N80, N91 or many more). It uses Python, which is available for free.
It is currently not complete. It does not fully work yet and is only suitable for alpha release. When it is complete you will be able to search for torrents and download them.
You will need a S60 (Symbian) phone. WizBit should work OK on all the devices here. WizBit requires the SHA algorithm to work, free from the PyPy library. WizBit should install and run fine on most S60 devices with Python installed.