Hi,
The Sony Ericsson P800, P900 and P910 can play MODs and SIDs via freeware software - I have a few of each type on my phone. The writer of the software originally stated that SID/MOD ring tone support was on his "to do" list, but development appears to have stopped quite some time ago, unfortunately.
Some info on the software required is here:
N-Player - Ali
