Where is the option to checkout with a phone payment?

Our Shopify powered checkout uses Shop Pay to make your checkout experience as fast as possible by automatically importing your credit card and billing information, just like PayPal. If you place an initial order with us using Shop Pay, the next time you place an order it will fast track you to that same experience. If you'd rather use a different express checkout option you should click on the link at the bottom of Shop Pay which says "Check out as guest." You can then proceed through checkout and select Phone Payment at the Payment step.