In some regions, you can make emergency calls from
HTC Desire 550 even if the
nano SIM card has been blocked or if you don't have one installed.
Important: If you don't have a network signal, you won't be able to make an emergency call.
Home screen, tap the phone icon to open the
Dial the emergency number for your locale, and then tap
Tip: If you've enabled but forgotten your lock password or lock pattern, you can still make emergency calls by tapping
Emergency on the screen.