Hey @chad1925, welcome to the community!
Right now, the option to pay by mobile isn't available if your account is eligible for a 30-day trial. Since you created a new account, it's most likely eligible right now.
I'd suggest getting the 30-day trial using a valid payment method (e.g. credit card), and then updating the payment method to your service provider.
“Music acts like a magic key, to which the most tightly closed heart opens.”
― Maria Augusta von Trapp