Carrier billing in Google Play with the eDGe?

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http://www.mobileread.com – I am in Germany, and here, Google has recently opened her shop for books. Since I am the proud owner of the eDGe, I thought - I use funds from prepaid cards that I can get for free, to pay for apps, and when Google allows to pay for books too, use this pay method in the Play Store. But how I teach the eDGe, to enable the carrier billing in the store? I try this: - I add ro.com.google.clintidbase=android-o2-de in build.prop (o2 is my mobile carrier) - with joikuspot in my Symbian phone I make a hotspot to get a mobile IP adress - delete cache und data in Google Play - add my mobile numbe (HowTos)