Not many I think, not so many phones support eRCP yet.
No phone from Nokia support eRCP, but eSWT is supported in all Nokia S60 phones from version 3.2.

There is the new Sprint Titan platform with OSGI Technology in the Mobile, it will be released very soon (???), with support first for eRCP (IBM/j9) on windows Mobile devices. I did not found so much about at http://developer.sprint.com/ , but I found this about developer Tools for the Sprint Titan Platform: http://developers.sun.com/mobility/c...oads/index.jsp