Receiving A Call When The Phone Is Locked - HTC hd2 User Manual

Note If you have set a password for your phone, you will be prompted for
the password before you can view the information. See "Protecting
your phone with a password" in Chapter 14 for information on setting a
password.

Receiving a call when the phone is locked

You can receive and answer calls even when your phone is locked. For
more information about answering calls, see "Answering and Ending
Calls" in Chapter 2.
After you end the call, your phone remains locked and the Lock screen
is displayed. You need to unlock your phone to use it.
Chapter 1 Getting Started