Jan Koum got the idea for $19 billion WhatsApp after missing too many iPhone calls at the gym

even though it was accepted into Apple’s App Store, Koum recounted.”We were so excited when it launched,” he said. “And so disappointed when no one used it.”That soon changed, however.By 2014, WhatsApp, thanks to its easy-to-use interface and uncluttered …
( read original story …)