The Taiwan government is planning the auction of WiMAX spectrum. Operators will not be allowed to offer voice services (VoIP over WiMAX). This way 3G operators are to be protected.
Personally I feel this is not the way to go. 'Voice is an application' in an all-IP world. This is too artificial and too much protectionism instead of free market dynamics. If 3G operators are afraid of WiMAX (notably the 802.16e incarnation that offers mobility), this shows the potentially disruptive nature of WiMAX.