1. To make an outbound call, make sure that you have selected the right country code from the dialler (UAE by default), then enter the phone number you wish to call and press the dial button 
2. Another way to make an outbound call is done as follows:
- Go to the call history section by clicking on the phone icon
it will show all phone calls received and made select a number you wish to call from the list and click the dial button on the ride side of the number