Why am I having trouble calling a mobile or landline?

To make a call, tap on the keypad button and dial the 10 digit number (US phone number) as you would with a regular handset. Once the number appears as you want to dial it, press the Call button.

Also, you can call a number on your Contacts.

NOTE: In order to make international calls (outside USA) you have to purchase the International subscription or buy credits. You can find more information in the following link.