No current phones (as of October 2006) are capable of operating in the AWS band. ... The chart above also shows why current UMTS 2100 phones aren't compatible with the AWS band. UMTS 2100 phones ...

And AT&T's LTE devices support both 700 MHz and AWS bands for LTE. (An AT&T representative declined to discuss whether the carrier has launched any commercial AWS LTE markets.) ...

Verizon Wireless has been accruing AWS spectrum by the bucket full over the past couple of years, but the operator has yet to make use of it for consumers. That’s going to change soon, according ...

Fig. 1: Sweep response of the CMT Model CMN719 AWS band reject filter. The red trace is the filter's insertion loss in dB. The blue trace is the filter's return loss in dB. ©CMT, used with permission ...

Because, as this article says and the chart shows, the lower half (the half used for phone-to-tower) is completely different. It lines up with DCS, but not UMTS 2100.

But why is the AWS spectrum band important for the rollout of LTE network technology in the United States? To date, most noise on the LTE front has been in the 700 MHz band.