the core business while starting was providing calling services.if they remained in their core business which is voice segment, we would have no mpesa. While introducing internet services, it was still no core business, but has succeded. Core business is an outdated concept of running businesses and should be left to the industrial revolution. We are in a new age, where core business doesn't matter, as long as ventures are breaking even and are being driven by innovation.
Who knows the core business of google anymore?