Sprint (NYSE:S) boasts its 4G LTE buildout is "underway" in over 100 cities, including New York, Philadelphia, L.A., and Boston. However, the carrier, which currently supports LTE in 19 markets, only promises service availability at some point "in the coming months." Sprint, whose dearth of current LTE coverage could be a disadvantage this fall as an LTE iPhone arrives, still expects to finish its LTE buildout by the end of 2013. (Nomura upgrade)