Many of us assume that if you call an emergency number like 911, 999 or 112, someone will answer quickly and help will arrive soon wherever we are in the world.
But across Africa, this isn't always the case.
In Kenya's capital Nairobi, for example, there are more than 50 different numbers for emergency services. Ringing round trying to find an available crew can be a lengthy - and potentially life-jeopardising - process.