To make calls select the “Keypad” icon from the system menu,
then enter the number you want to dial.

After entering the destination number tap the green handset
icon to start the call.
Keep in mind if you have not enter any number and tap the
handset icon the app will show the last dialed number.

Optionally there is a dialing menu from where video calls can
be made.
To open the dialing menu press and hold the dialing button
for about 1 second, after that the following options will be shown:

Auto Call / Call :
Places a regular voice call
Video Call : start a
video call, keep in mind that to have actual video the destination device must
also support video calls
GSM Call: will dial the number using the phone’s carrier
service
Copy Number: Copy the number into the clipboard
When making calls from the Contacts list, audio or video
calls can be started directly using the handset and camera icons on the right
on the contact name.

In addition, you can also make audio and video calls from the
Call History.
To make a regular audio call just tap the number you want to
redial.
To make video calls press and hold the previously call number,
after about a second the dialing menu previously described will be shown

Finally, during an ongoing call, video can be enabled or
disabled by selecting the camera icon
