Just posting on behalf of the customer (I wanted to forward the information they requested along).
"It would be amazing to have a cc on my account for monthly billing and then have the option to add a 2nd card when i need to place a device order. It's inconvenient to change the credit card on file, place my phone order and then remember to change it back to my monthly billing card. I would also like to see PayPal as a payment option! Thanks for listening TING!"