Gigabit cellular networks could happen with 24GHz spectrum.
"A Notice of Inquiry issued unanimously by the commission on Friday identifies frequencies of 24GHz and above as being able to provide gigabit or even 10Gbps speed. This would be a major change because today’s cellular networks use frequencies from 600MHz to 3GHz, with so-called “beachfront spectrum” under 1GHz being the most desirable because it can be used to deliver data over long distances. AT&T and Verizon Wireless control the most beachfront spectrum. The FCC’s notice talks about frequencies as high as 90GHz. A new Wi-Fi standard that uses 60GHz can deliver up to 7Gbps"
http://arstechnica.com/information-technology/2014/10/gigabit-cellular-networks-could-happen-with-24ghz-spectrum-fcc-says/