Thanks to GFN I like to awake this thread:

I successfully highjacked a thread talking about what is called "Vodafone Duobill".
http://forums.precentral.net/hp-veer...ml#post2994789
One SIM card with two different numbers.
German PDF manual here.

It doesn't work (at least with my old SIM card) as expected and I'm wondering what can we do with the SIM Toolkit.
Has anybody seen any useful function in that app?