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2. Type the extension number.
Dial using numbers or letters
When you type a letter in a phone number, your BlackBerry® device dials the number that is associated with the letter on a conventional phone
keypad.
• To type a number, press a number key.
• To type a letter, press and hold the Alt key. Press the letter key.
Switch applications during a call
During a call, press the key > Switch Application.
Note: If you switch to a different application and you want to end the call, press the key.
About using a headset
You can purchase an optional headset to use with your BlackBerry® device.
If you use a headset, you can use a headset button to answer or end a call, or to turn on or turn off mute during a call. Depending on your device
model, you might be able to use a headset button to make a call using a voice command.
Depending on your headset, you might also be able to use a headset button to pause, resume, skip, or adjust the volume of audio or video files.
For more information about using the headset, see the documentation that came with your headset.
Emergency calls
About emergency calls and Emergency Callback Mode
If you are outside of a wireless coverage area and the SOS wireless coverage indicator appears at the top of the screen, you can call only
emergency numbers. Your BlackBerry® device is designed to allow emergency calls even when your device is locked. Depending on your device
model and the wireless network that your device is connected to, your device is also designed to allow emergency calls when the SIM card is
not inserted. If the connection to the wireless network is turned off when you initiate an emergency call, your device is designed to connect to
the wireless network automatically. You can make emergency calls by typing only official emergency access numbers (for example, 911 or 112).
Note: You should not rely on any wireless device for essential communications, including medical emergencies. Emergency numbers may vary
by location and emergency calls may be blocked or impeded by network, environmental, or interference issues.
If your device is connected to a CDMA network, when you end an emergency call, your device enters Emergency Callback Mode. This mode
allows the operator to call you back or find your approximate location. Depending on your wireless service provider, Emergency Callback Mode
is active for 5 minutes or until you make a non-emergency call. In Emergency Callback Mode, you cannot send and receive messages or browse
web pages.
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