HTC One M9 User Manual page 173

Calling a number in a message, email, or calendar event
When you receive a text message, email, or calendar event that has a phone number in
it, you can just tap the number to place a call.
Making an emergency call
In some regions, you can make emergency calls from HTC One M9 even if the
nano SIM card has been blocked or if you don't have one installed.
If you don't have a network signal, you won't be able to make an emergency
call.
1. On the Home screen, tap the phone icon to open the Phone app.
2. Dial the emergency number for your locale, and then tap Call.
If you've enabled but forgotten your lock password or lock pattern, you can
still make emergency calls by tapping Emergency call on the screen.
Phone calls 173