"Security by Default" queried all Spanish numbers, it's not like you can download a user list. It's not the same.

But it's safe to say that 1/4 of your WHOLE country uses Whatsapp, and the smartphone penetration of your country is like 44%. That means about half of the people that have a smartphone in your country uses Whatsapp.

And that's just your country. Actually more than half of the people in the world that have a smartphone uses Whatsapp. A lot of people have paid. Maybe spanish people don't like to pay, but a lot of people paid.

I know you're afraid to query, but I bet you: +90% of your (mobile) contacts use Whatsapp.

And yeah this is turning a little bit off topic here.