Your customers can't order, if they can't remember how to reach you.
Not everyone can get a vanity phone number that everyone can remember easily. Not everyone can get that perfect domain name either.
Let's face it, people don't remember numbers and what you sell may not be the same or even related to your company's domain name. How will they ever find you?
Get a RingWord. Advertise that. Customers will never forget how to reach you, even if you change your phone number, domain name, or company.
A RingWord IS your product, service, or you.