Comment Re:Whatsapp is ubiquitous in many places of the wo (Score 3, Informative) 116
I may add to this, when you're traveling it usually costs ~$1/day for some megs of data roaming (5-50mb i've seen), which is more than enough to send lots of messages, while ONE roaming SMS may cost the same. Again, probably not very common in the US to travel abroad, but think about Europe how much people travel and live in any other European country other than their own and where they have most of friends/family. You'd use Whatsapp (or something similar) lots more if you had to pay roaming charges to send SMS across states in the US.