I've used both PocketPuTTY and PockeTTY for mudding. They're both attempts at a Windows Mobile clone of PuTTY. Those programs are much more effective when connecting to, for instance, a Linux server with mudding tools installed. In a pinch, though, a direct mud connection would be bearable. I guess when you're mudding from a phone, you accept a certain lack of amenities in advance :P.