From this article:
8 Ways to Shrink Your Cell Phone Bill | Fox News Magazine
8 Ways to Shrink Your Cell Phone Bill | Fox News Magazine
(bold added by me)Use texting apps: If you opt for a smartphone, then you can download one of the free texting apps to your phone so you won't have to pay for texts. My personal favorite is [URL="http://itunes.apple.com/us/app/whatsapp-messenger/id310633997?mt=8&at=10l3Vy]WhatsApp[/URL], because you can use it on four types of smartphones: BlackBerry, iPhone, Google Android, and the Nokia phone. And the best part about this cool app is that it's free!