Location: Zoom Sprint IP Relay: You can make calls with Sprint IP Relay on your smartphone, tablet or computer to type and view messages. This relay service allows the user to make phone calls using text (no voice or hearing required). How does it work? You type what you want to say to the operator, and then the operator relays the message to your caller and types their response back to you. Sprint Web CapTel: This relay service works a little different; you can use any telephone and connect via computer/tablet to read captions on the call. Using the telephone allows you to use your own voice.