For people who don't have Internet access, the CapTel 840 relies on a landline (analog telephone line) to provide captions and voice. This is also known as a one-line CapTel. The CapTel 840 can automatically connect to the captioning service for all calls dialed when the captioning button is on.


Individuals calling the CapTel user will need to first dial the toll-free number 1-877-243-2823 and enter the phone number of the CapTel user in order for the call to be captioned. If the Captel users number is dialed directly the call will be completed without captions.

CapTel 840 Phone Features

  • Requires an analog phone line. DSL can be supported if using an appropriate filter

  • Large screen with easy-to-read captions

  • Built-in answering machine with captions

  • One touch button to reach customer service 24/7

  • Available in Spanish

  • Captioning service is FREE

CapTel 840


Line 1:*

Telephone line:

  • Analog

  • DSL with digital filter


Line 2 (optional):*

2nd analog telephone line


* Not compatible with PBX system
    unless an analog port is available.

VIDEO: CapTel 840 Overview

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SPRINT CAPTEL: FEDERAL LAW PROHIBITS ANYONE BUT REGISTERED USERS WITH HEARING LOSS FROM USING INTERNET PROTOCOL (IP) CAPTIONED TELEPHONES WITH THE CAPTIONS TURNED ON. IP Captioned Telephone Service may use a live operator. The operator generates captions of what the other party to the call says. These captions are then sent to your phone. There is a cost for each minute of captions generated, paid from a federally administered fund. No cost is passed on to the CapTel user for using the service. CapTel is a registered trademark of Ultratec, Inc.  

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