BenQ Z2 - Manual (Page 40)

24 Using Your Phone
Rejecting an Incoming Call
To reject an incoming call, you can either press , or
long-press the upper portion of the volume key on the left side of
the phone.
Muting the Ring Tone for an Incoming Call
Long-pressing the lower portion of the volume key will mute the ring
tone for an incoming call to avoid disturbing others. You can still
answer the call after the ring tone has been turned off.
Adjusting the Volume
During a call, if you want to adjust the speech volume, you can press the
volume key on the left side of the phone.
Making an International Call
1. Enter the outgoing international call code, or long-press until
"+" appears on the display.
2. Enter the recipient's country code, area code and phone number.
Dial the call by pressing .