There is some debate over what makes a 4G network.
Loosely speaking, 4G means the fourth generation of mobile networks, as opposed to the 3G - third generation - networks being used today.
1G networks - the first generation - used analog signals and were only capable of voice calling. 2G networks incorporated digital technology and allowed basic data features like texting. Today's 3G networks can be used to browse the Internet and for a whole slew of other mobile applications.
Both AT&T and Verizon say their new networks, which will allow for blazing data speeds, represent the next generation of wireless technology and therefore claim the 4G title.
"What it really boils down to is speed," said AT&T spokeswoman Erika Urling.
But it might not be that simple.
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Mobile industry analyst Chris Kissel said there is no formal standard for what makes a 4G network.
However, Kissel said there is a "tacit understanding" among mobile device and infrastructure manufacturers that a 1Gbps download speed would be central to any 4G standard set by the International Telecommunication Union.
Neither Verizon's nor AT&T's 4G networks come close to that. Both companies' 4G networks, as well as Sprint's 4G network, are capable of only 5 to 10 Mbps on downlink, he said.
That is still several times faster than 3G speeds, Kissel said.

