Phone Numbers Stink -- CALL SIGNS are COOL! This application makes it easy to call those friends and businesses that have registered their own Call Sign. Words are so much easier to remember than numbers, and many people and businesses have already created their own Call Sign from our website at www.CallSigns.co. Call Signs not only point to a phone number, but can also display other contact information. And, press the 'addí' button to upload to Call Sign's address book.