4g phones are not out yet, but most carriers are looking at LTE for mobile 4G, while WiMAX is being looked into more for fixed wireless data networks…

4G will likely operate within the 700Mhz spectrum that the analog television stations broadcast on some time after the digital transition…

4G is still some ways away… the 3G networks cost the carriers alot of money, and they are still making money for the companies… so it will be several years before 4G really starts coming out…

Depends… the definition is actually still up in the air and the technologies now being adopted by major mobile carriers which were being consider 4G are currently not being considered 4G despite the large advancements they offer on the current technology.

The biggest market for 4G is in the technology called LTE.

http://en.wikipedia.org/wiki/3GPP_Long_T…

However, it's not being considered 4G, anymore. True 4G can be find in the objectives specified here.

http://en.wikipedia.org/wiki/4G#Objectiv…

You might note that despite the LTE article claiming the technology is not 4G, the 4G article references it at 4G more than once. All of the technologies that meet the objectives of true 4G are currently nothing more than theoretical samples and are not available for a wide scale distribution.