The way phone calling works here is that you use the country code 254 and
'+' before that, then the number. The actual number is 718xxxxxx. But
sometimes you will see it written as 0718xxxxxx because that is how you dial
the number locally. So if you see the zero on a number, drop it and add
+254. Hope that makes sense. Sudan is +249. The number in Kenya always
starts with a '7' and in Sudan they always start with '9'. This is only true
for mobile numbers. Land lines get more complicated. They are usually a
number starting with '2' in Kenya. They are a shorter number and instead of
adding a '0' in front, you add '020'. I'm not sure how you dial it
internationally, but I assume that instead of 020 you do +254.