HTC Desire 626s User Manual page 93

Mute : Mute the microphone during an active call. Tap again to unmute the microphone.
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Note: If Mute is activated, the speaker mode is deactivated.
Speaker : Route the phone's audio through the speaker (On) or through the earpiece (Off).
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Activate Speaker to route the phone's audio through the speaker. (You can adjust the
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speaker volume using the Volume Button.)
Deactivate Speaker to use the phone's earpiece.
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Warning: Because of higher volume levels, do not place the phone near your ear during
speakerphone use.
Dialpad : Use the onscreen dialpad to enter additional numbers, for example, an extension
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or access code.
For example: When you call your bank's 800 number, use your dialpad to enter your account
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number and PIN.
Tap to view more in-call options.
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Add call: Tap to initiate a conference call (3-way call).
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Flash: Tap to put the current call on hold.
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People to display your contacts list.
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Open contact card to display the caller's contact information.
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End a Call
There are a couple of options for ending a phone call.
Phone App 81