Do you remember the Mobile Web Service announcement at the ITU Telecom World 2003? Or the technical road map for specifications that address such issues as integrating GSM-based security services with the Web services architecture at the PDC in Los Angeles Oct 27- 30.
Nothing very spectacular happened since that.
The Vodafon's Mobile Web Service contest has been closed recently. The jury will select the winner until 03/03/2004.
In the meantime you should look for candidates that are already online.

Have a look at VodaBlog and you will agree that we are in the very early stages of Mobile Web Services adoption.

I am curious which submission will win.