Thanks to some help with testing from Yandere and Aurelli last night, I can confirm that we now have a workaround for the blockade that has prevented Wii users from connecting to Sylverant. I will be posting a more complete guide later on, but I wanted to at least get the information out sooner rather than later.
Here’s the information you should need:
Phone Number: 74623185647463
Please see this post for updated information.
Leave the rest of the provider settings as their default values (i.e, automatically obtain DNS, no proxy, etc).
Being that the phone number required here is somewhat long, I’d suggest using multiple provider settings if you wish to connect to other servers (rather than just changing the phone number in the provider options).