I use smartcard reader for this.

I recommend http://nobbi.com/download/SIMspyII.zip for PC/SC readers (Towitoko) or http://www.endorasoft.es/download/xsim.zip for smartmouse / phoenix based readers.
You should find PC/SC Reader at most Computer-Shops.

Remove the Batterie from your phone, and read Kc from Sim-Card (Don't Switch off Phone or Kc will be deleted from SIM)

> Date: Wed, 16 Feb 2011 21:19:44 +0000
> From: mattjevans@btinternet.com
> Subject: Extract Kc from Phone?
> To: baseband-devel@lists.osmocom.org
>
> Hi all,
>
> Does anyone have any suggestions with regard to models of phone in which it is
> easy to view the current Kc? I have a Motorola C115, Nokia 3310/6630, Android
> Desire, iPhone etc. I can get every everything from the in built field test
> modes, however I really want to get the current session key so that I can
> verify/analyse my captured bursts.
>
> Thanks,
>
> Matt.
>