Heads up, Sprint customers, because it looks like some new Sprint Spark and 1.9GHz LTE expansions are coming your way tomorrow.

An anonymous Sprint tipster has sent us an image that shows that Sprint will be expanding its Sprint Spark and LTE coverage tomorrow, September 11. Sprint Spark will launch in 18 markets, including Toledo, Ohio, Madison, Wisc., Green Bay, Wisc., Buffalo-Niagara Falls, N.Y., and Corpus Cristi, Texas. This expansion will bring Sprint Spark to a total of 167 markets. Meanwhile, Sprint’s 1.9GHz LTE coverage is expected to expand to three more markets: Lewiston-Moscow, Idaho-Washington; Winona, Minn.; and Duango, Colo.

Sprint Spark utilizes three different LTE bands to offer increased capacity and faster speeds. More LTE goodness is always a good thing, and this leak shows that a lot of Sprint customers are going to get some of it tomorrow.