This is what I find ****ing offensive when I come over to a message board and read about what appears to be rapid battery drain. By default your wireless device is a phone, and chief among those lauded features is the ability to make or receive a call while within your coverage area. It's an odd concept for sure, but there really are people out there that prefer to pick up the phone and call someone rather than hit up their social networks and cut a few tweets, poke their girlfriends on Facebook or pin something on Pintrest.
Lumia 920 - computer
Nexus 4 - computer
iPhone 5 - computer
Jitterbug - phone
Laptops usually last how long before you need to charge them? Then you add cellular radios and data connectivity to it. You play games on it and watch movies on it. You make phone calls and receive text messages. So it only lasts for 12 hours? Really? That's terrible!