Hello dear Kaimul, welcome to Jawwy from stc. Glad to assist you.
For making international calls, you just need to buy the PayGo balance from the "Shop" section through our Jawwy app or through your account on our website, under "My Add-ons". Billing for international calls is per 30 seconds only.
You can check the rates of the international minutes for each country as well as the Peak hours by visiting this link HERE
With thanks and appreciation,
Ahmed Omar
