As for Sprint Spark, that service is now available in 3 new markets; St. Louis Missouri and Winston-Salem / Greensboro North Carolina. Sprint Spark is their enhanced LTE service designed to deliver 6-15 Mbps and peak speeds of 50 -60 Mbps. Their goal is to have 100 million people covered with Spark by the middle of this year.
Sprint will also be deploying 8T8R radios to help improve coverage and signal strength. The new radios will boost network reliability and be able to transmit more data at higher data speeds at 2.5GHz. The company is field testing it right now and is expecting to start deployment later this summer.
Via Sprint