Is the us supported by mobile phone billing

United States of America

• Apple Card
• Apple Pay
• Apple Cash
• Most credit and debit cards
• PayPal
• Apple ID balance (from redeeming Apple Gift Card or adding funds)

And if you look at the Related Article that you came to the forum with, you will see that mobile billing is not an option in the US. And the list that SravanKrA provided, mobile billing was not listed as a payment method, so it isn't available.