How to turn off voicemail for Swisscom (.ch) mobiles

This blog post explains how to turn off the voicemail service (named COMBOX) provided (and enabled by default) by the Swiss mobile carrier Swisscom.

According to this PDF, lined from http://www.swisscom.ch/res/mobile/combox/index.htm, dial the following numbers:

• ##61#
• ##62#
• ##67#