A recent message on the UbuntuOne mailing list announces that Canonical has teamed up with Funambol, an established software stack that synchronizes thousands of mobile phones and other devices who have built a community around different client plugins, virtually supporting the majority of the existing software on all platforms that have contacts (Thunderbird, Outlook, Mac OS X Mail, etc). That means that UbuntuOne gets mobile phones sync support, but unfortunately the new service will only be part of the UbuntuOne paid plans.