Using Speed Dial - HTC One User Manual

Using Speed dial

Use Speed dial to call a phone number with a single tap. For example, if
you assign a contact's number to the number 2 key, you can just press and
hold 2 to dial the number.
The number 1 key is reserved for your voicemail. Press and hold
this key to call voicemail and retrieve your voicemail messages.
Assigning a speed dial key
1. Open the Phone app.
2. Tap > Speed dial >
You can also press and hold an unassigned key on the dialpad, and
then tap Yes.
3. Select a contact from the list.
4. On the Speed dial screen, choose the phone number of the contact
to use, and a speed dial key to assign.
5. Tap Save.
.
Phone calls 149