[mehulved]

Can't you chat from wap.yahoo.com => messenger?
I remember chatting on yahoo messenger from that site when I had Nokia 6610. The way UI is very bad and you need to keep on refreshing it constantly to get new messages, it's not a plesant experience but that is all you can get. For msn messenger, it is atlanta.emessenger.net or something like that, don't remember now. You can check it up somewhere.