HTC HD2 Mode D'Emploi

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Chapter 2  Phone Calls  57
Making a call using Speed Dial
Do the following to call the contact that is assigned to a speed dial 
key:
On the Phone dialer screen, press and hold the assigned key, if it 
is a single-digit speed dial number.
To dial a two-digit speed dial number, tap the first number key 
first, and then press and hold the second number key.
2.5  Making Conference Calls
There are two ways to start a conference call from the Phone dialer 
screen. You can choose your participants first before starting the 
conference call. You can also dial or accept multiple calls one at a time 
and join them into a conference call.
Note 
Make sure your SIM card is enabled with conference calling service. 
Contact T-Mobile for details.
Selecting participants and starting the conference call
You need to enable conference mode in the Phone dialer so you can 
choose participants and start the conference call.
1.  Press the TALK/SEND button to open the Phone dialer.
2.  Tap Menu > Conference Mode.
.  If this is your first time to use conference mode, a message will 
be displayed, reminding you that conference calling service 
needs to be enabled first by T-Mobile before you can use it on 
your phone. If you do not have this service, contact T-Mobile to 
have it provisioned in your calling plan.
If you are ready to use conference calling, tap 
OK to proceed.