This is a really great app! Line2 was reviewed by David Pogue in The New York Times and it is amazing! Downloading this app gives you two lines on your iPhone or turns your iPod Touch into a cellphone (for $15 per month). It runs on WiFi and does not use up your AT&T minutes. If you have an iPhone, you might be able to subscribe to a less expensive minutes plan and if you have an iPod Touch, $15 per month seems a small price to pay to have phone capability! Happy Talking!