Good morning, welcome to Jawwy from STC, Thank you for contacting Jawwy, You can use the minutes in the flexible plan or add-ons to make national calls to ONLY mobile numbers and fixed landline numbers.
As for the premium numbers which begin with 9200/700/19 or else, you will need to buy PayGo credit under "Add-ons" section in Jawwy app and your account on the website. Additionally, the rate per minute is an average of 54 to 56 halala depending on the service provider.
Details through this link, How can I purchase PAYGO balance?
