Huawei UM840 Manual page 42

Note:
Contact your network operator to learn whether it supports conference
calls and how many participants you can add.
1. To initiate a conference call, dial the number of the first person
to be on the call. While you are on that call, press
then touch Add call.
2. Enter the phone number of the person you want to join the
conversation and press
log or Contacts. The first call is automatically placed on hold.
3. Once you have connected to the person you have added,
press
conference call.
4. To add more people, touch Add call and repeat steps 2 and
3.
5. To drop someone from the call or to talk privately to one
person, press
Calling
, and then touch Merge calls to begin the
Menu
, and then touch Manage conference call.
Menu
, or select someone from your Call
, and
Menu
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