HTC One M9 - Manual (Page 94)

Phone App 81
Phone App
The following topics outline the use of your device’s phone app to place and receive calls, use
voicemail, set up and manage contacts, and more.
HD™ Voice
Your phone is also HD Voice enabled, which means you can enjoy unparalleled voice quality in
areas with HD Voice service. Experience the crystal clear difference of HD Voice from Sprint on
calls between Sprint customers each using an HD Voice enabled phone while in areas with available
HD Voice service.
Note: HD Voice service is available in select markets. Visit sprint.com/coverage for more
information.
Place and Answer Calls
The following topics describe how to directly dial calls, how to answer incoming calls, and how to use
the in-call screen options.
Adjust In-Call Volume
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Adjusting Call Volume: Press the volume key up or down during the call.
Troubleshooting
Question: Difficulty during call.
Answer 1: It may not be possible to make a call properly in a noisy location.
Answer 2: When calling using Speaker, check the call volume. Raising the call volume may
make calling difficult.
Question: Sound pops momentarily during a call.
Answer: Are you changing location while calling? Sound pops when signal is weak and the
phone switches to a different area.
Emergency Call Cautions
Emergency calls are restricted in Airplane mode.