Cricket is one of the carrier that plan to offer LTE 4G service to their customer who starving to the superfast internet connections, Long Term Evolution. The company said in March that it was targeting 2012 for its first commercial LTE products (USB Modem) and it signed a roaming agreement with LightSquared.
Tucson, Arizona was selected to be the first city that will be radiated by Cricket's LTE network as the test later this year with the LTE USB Modem made by Huawei dubbed Huawei E397 - announced in MWC2011. And the Cricket's next three markets includes Phoenix, Las Vegas, and Philadelphia.
http://www.pcmag.com/article2/0,2817,2387403,00.asp
Update:
December 21, 2012 - Cricket officially launched their first LTE 4G service in Tucson. Huawei Boltz LTE is the first LTE device (USB modem) chosed by carrier for their
