Acer Liquid MT S120 - Manual (Page 29)

29 Voice call options
Conference calls
If you have one call on hold and another on the line, you can combine both
calls to create a conference call.
After the first call is established, tap to add a second call. When both calls
are connected, tap to start the conference call.
Viewing missed calls
Missed calls will be displayed by the call indicator in the Notification area with
the
icon.
You can also view missed calls from the Notification area.
1. Open the notification list by tapping the Notification area to display the
details of the missed calls.
2. Select the call from the list and tap Return call to return the missed call.
You can save phone numbers to your contacts list from the Call Log. Please
refer to “Adding a contact“ on page 23 for further details.