Step 1: Choose the app you wish to purchase.
Step 2: Select “Use M1 billing” as your payment method.
Step 3: Proceed to “Buy” and confirm your purchase.
Step 4: Your app installation will start automatically.
Yes. To delete Direct Carrier Billing from your Google wallet:
The default payment method is chosen in the following order: Google Play credit >
If you're having issues with an app purchase and want to give feedback or get help, you can contact the app developer. You can find the app developer contact details in the email receipt of purchase sent to your Gmail account or via Google Wallet at http://wallet.google.com. Alternatively, to find a developer's contact information on your mobile device: