>>34693146whatsapp using the numbers from your phone's contact list anyway, so once you get their number you also get their whatsapp, as it were.
It uses data rather than texts and these days data is in abundance, it can also go off wifi which is better
you can send emojies, pictures, voice clips, videos.
also you can see the status of your message, have they received it, have they watched it?
basically if you ask someone to text you rather than whatsapp.... it would be like when you're back in school, a girl asks for your MSN and you say "uhhh... how about email?"