Can the internet reboot Africa?

With smartphone use and web penetration soaring, Africa is set for a tech revolution - but only if its infrastructure can support it

You can buy sunlight with your phone, conduct an eye test on someone 100 miles away and attend a church service on your iPad. There are apps for investing in cows, for sending parcels and for mapping unrest. And soon you'll be able to deliver blood and medicines by drone.

There's free Facebook, mobile banking, and the promise of cashless societies and digitised land records. And from Accra in the west to Kigali in the east, a spray of "tech hubs" talk about "leapfrogging" technology and incubating start-ups.