Calling Serbia from Cape Verde is possible, but there are a few things you need to know in order to make the call. First, you will need to find out the international calling code for Serbia, which is +381. Next, you will need to find out the country code for Cape Verde, which is +238. Finally, you will need to dial 011 (the international calling code for the United States) followed by the country code for Serbia and the phone number you are trying to reach. So, to call a phone number in Serbia from Cape Verde, you would dial: 011+381+phone number.