I use Whatsapp all the time.
In Brazil the phone operators charge per message and calls per minute, so they're super expensive.
Tim, Vivo and Oi are desperate trying to ban Whatsapp in Brazil, saying it's affecting their business.
Well, now i live in the US, it's awesome to have a plan with a real 4g internet. I never thought I'd someday have a Skype conference with my friends walking on the street and that's what i do. Friends and relatives in Brazil feel really jealous LOL.
And Whatsapp is much better because it allows me to send files, pictures, short videos or even call FOR FREE.
Now i just need more friends here in the US, specially in Dallas, because I feel bored on my days off with nothing to do and I don't know anything here.
BTW, my mobile/whatsapp is (661) 238 6684.