AT&T and Verizon argue over which company has the truly “fastest 4G speeds” or the “largest 4G network”, but in the end, both are fast enough to get the downloading job done in most places that people live. However, the story is slightly different in Chicago. In the Windy City, AT&T sees data download speeds that are dramatically lower than Verizon’s and even compared to AT&T’s national average. The reason? Lack of applicable spectrum. Which explains why it was slow to send out a tweet from there earlier this year, despite the fact that I was standing next to an AT&T building.