I am not so sure that is the reason for WhatsApp crazy validation. I feel that the reason for that was that it represented a danger for Facebook and Mark wisely acquired at any cost.
WhatsApp is big outside of the US because (at least in Panama, were I was born) text messages are not included in the mobile phone plan; however, you can get a data plan for a monthly fee and keep in contact without additional charges. In the US most people use text messages to communicate.
WhatsApp is big outside of the US because (at least in Panama, were I was born) text messages are not included in the mobile phone plan; however, you can get a data plan for a monthly fee and keep in contact without additional charges. In the US most people use text messages to communicate.