The AWS band uses*microwave*frequencies*in 2 segments: from 1710-1755*MHz for uplink, and from 2110-2155*MHz for downlink. The service is intended to be used by mobile devices such as wireless phones for mobile data, video, and messaging services. Most manufacturers of smartphone mobile handsets provide versions of their phones that include radios that can communicate using the AWS spectrum. Since for downlink AWS uses a subset of*UMTS frequency B1 (2100MHz)*some UMTS2100 capable handsets do detect AWS networks but cannot register on them due to the difference in uplink frequencies (1710