No you are wrong.
Look at a map of Africa, then note all the straight lines used to show the borders of each country.
Note that there are an abnormal number of straight borders.
Now blame the colonial powers, France, UK, Belgium, Germany, Holland and Portugal.
They were the ones that arbitrarily drew the straight lines without any regard or consideration the the people of Africa.
Next blame all the despots that rule the African countries.
Don't blame the tribes or the mobile phone.