Google Play carrier billing

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http://forum.xda-developers.com – I don't even have the option to use carrier billing. It asks for a credit card but that's all. I checked online and my phone isn't listed in my account. And there is no way to add a phone. It's odd because about a week ago, my phone and one credit card was listed and now they are gone and it doesn't even give the carrier billing option when purchasing apps. Any recommendations? (HowTos)