Sprint today announced that its juiced-up 4G network, called Sprint Spark, is now available in Baltimore and Philadelphia. Sprint Spark uses tri-band LTE to help improve access to, and the performance of, its 4G network. In order to use Sprint Spark, Sprint customers must have Spark-compatible smartphones. Only a handful of Sprint's smartphones work with Spark, including the LG G2, the HTC One max, the Samsung Galaxy Mega, and a newer version of the Samsung Galaxy S4. Sprint Spark is available in 14 markets, and Sprint plans to cover 100 markets by the end of the year. Sprint claims Spark enables peak download speeds of 60Mbps.


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