WSS 3.0 accessing via anonymous and mobile browser

I've setup a WSS 3.0 site and granted anonymous access to the entire
site. I've also added a Task list and granted it special rights to
allow anonymous users to add, edit and delete that list. It works
fine in IE and Firefox when using the primary web interface (http://
website), but if I use the mobile web interface (http://website/m) it
asks for credentials when I try and access that list.
Any ideas?
Thanks

.