AT&T was the convenient choice for Apple, but company faces tough questions from users
Wi-Fi use quadrupled in 2009, mostly via smartphones, carrier says
Violators face $2,750 fine
But wireless business shows growth
68 million Android devices projected to ship in 2013, second only to Nokia's Symbian OS
Expected device may run on both AT&T and Verizon 3G networks, sources say
Apple will surely need to follow with free GPS, analyst adds
Critics say converting Wi-Fi to power needs to be more efficient to work
Nokia says its offer is global, while Google's is only U.S.
New 70% royalty for authors on Kindle would mirror AppStore royalties
