Phone Calls and Voicemail 104
CDMA Call Settings
Use these options to enable hearing aid compatibility, and adjust several call settings, such as
teletypewriter (TTY) mode.
1. Tap > > Settings.
2. Tap Call.
3. Tap CDMA call settings.
TTY (Teletypewriter) Mode
TTY mode allows people who have hearing or speech impediments to communicate by telephone.
HTC U11 is compatible with select TTY phones. Contact your TTY phone manufacturer to see if the
phone supports digital wireless transmission. HTC U11 and the TTY phone connect using a special cable
that may come with the TTY phone. If this cable was not provided with your TTY phone, contact your TTY
phone manufacturer to purchase the connector cable. Most TTY phones connect via a 2.5 mm headset
jack adapter. HTC provides a 2.5 mm headset jack adapter that connects to the USB Type-C port on
HTC U11. To request this adapter, contact HTC by chat or email at htc.com/us/support.
When establishing your Sprint service, please call Sprint Customer Service using the state
Telecommunications Relay Service (TRS) by first dialing . Then provide the
state TRS with this number: 866-727-4889.
To turn TTY Mode on or off:
1. Tap > > Settings.
2. Tap Call.
3. Tap CDMA call settings > TTY mode.
4. Tap TTY Full, TTY HCO, or TTY VCO. Tap TTY Off to turn TTY mode off.
Note: When enabled, TTY mode may impair the audio quality of non-TTY phones connected to the
headset jack.
Warning: 9-1-1 Emergency Calling
Sprint recommends that TTY users make emergency calls by other means, including
Telecommunications Relay Services (TRS), analog cellular, and landline communications. Wireless TTY
calls to 9-1-1 may be corrupted when received by public safety answering points (PSAPs), rendering
some communications unintelligible. The problem encountered appears related to TTY equipment or
software used by PSAPs. This matter has been brought to the attention of the FCC, and the wireless
industry and the PSAP community are currently working to resolve this.
Other CDMA Call Settings
Select these options to enhance voice privacy, prepend numbers automatically, or use plus code dialing.
1. Tap > > Settings.
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