HTC 10 Sprint - Manual (Page 94)

Phone Calls and Voicemail 81
4. Tap the contact you want to call.
 To check other phone numbers associated with the contact, tap beside the contact
name.
 If the phone number has an extension, tap after connecting to the main line and then dial
the extension number.
5. To hang up, tap End call.
Change the Phone Dialer Layout
Switch between a large or standard dial keypad.
1. Tap > to display the phone ’s dialer screen.
2. Tap > Large dial pad or Standard dial pad.
Troubleshooting
Question: Call does not connect.
Answer 1: Was the number dialed using the area code? Try dialing the number starting with "0."
Answer 2: Are you in an area with poor wireless coverage? Try calling again from another area.
Dial an Extension Number
To skip voice prompts when dialing an extension number, do one of the following.