[Q]Play Store Carrier billing - Vodafone Germany

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http://forum.xda-developers.com – Hi, i´ve got a O2 branded HOX but i´ve flashed the latest ICS Version of Insertcoin. I´m using a german Vodafone PrePaid Card in my Phone. The Problem is, that i cannot buy apps using my sim card.. only the credit card option is available :( i´ve tried a few tutorials on the net to mod my build.prop with the following string: android-vf-de but without luck :( i´ve also deleted data and cach for the play store and rebootet the phone, but the carrier billing option is not available. please help me with this problem. (HowTos)