samsung nexus s - Change own phone number in ICS

I've change the SIM in my Galaxy-Nexus-S. Under Settings -> About phone -> Status there still is the old phone number and I cannot manage to change it.

I've seen this answer which is outdated. The menu option Own numbers discribed in the answer is not there in ICS.

_{The navigation terms might be called differently, as I manually translated the names from German.}