Whatsapp entered a highly competitive market. They've got the highest active users in the SMS market, and over 400M subscribers within 4 years. How they did it?
They've kept it simple, you don't need to fill up sign up forms and remember your user name. Your GSM SIM card is your identity.
Secondly, they tightly focused on SMS market. Didn't go for multi party video conferencing, screen sharing, and other seemingly cool stuff.
Answered 11 years ago
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