I have a Sony Ericsson phone, the C510. I use Ubuntu One's SyncML server to synchronize my contacts list. This setup worked fine up until a month or two ago.
Now, every time the phone tries to sync or I manually ask it to, it says something about connection terminated.
When I try to browse to http://syncml.one.ubuntu.com , I can reach the server but my phone asks for a confirmation to continue browsing on an untrusted site. Could this be part of the problem?