I just searched the forum, some threads came up, but no conclusive answer.
There is something in the themes section called MobileCube, but accessing the website
http://phireware.com/projects/mobilecube/ only gives "The page you’re looking for can’t be found". Project dead?
I have an old Nokia E61i phone with a resolution of 320x240, which is not usable with RC, and I'm planning on purchasing one or two Android smartphones with different higher resolutions.
Some suggested using the built-in e-mail client instead, but RC is so much better (and if it's only about the access to the LDAP address-books).
I wonder what's in the works, and if the RC devs also have use for accessing RC on mobile phones.