There is a local Thai restaurant that, for years, has had what I consider the best system available for takeout and delivery. The first time I called for delivery, they took down my address and cc info. Now, anytime I call after, they know me by the caller ID and already have all my information available.

It is easier to call and place an order than most any app or website for follow-up orders at least.

This should be a standard feature of any restaurant ordering system.