U.S. mobile operator Sprint has announced improved 3G and all-new 4G LTE network, which now includes Sprint Spark, in Chicago. According to sprint, the company undertook a massive initiative to “rip and replace” equipment from its 38,000 cell sites across the country. This campaign has largely been completed in Chicago and the company expects Chicagoans to experience the benefits of a much more robust, reliable network.

Sprint plans to deploy Sprint Spark in about 100 of America’s largest cities during the next three years, with availability today in New York, Los Angeles, Chicago, Tampa and Miami. By the end of 2014, the company expects 100 million Americans will have tri-band or Sprint Spark coverage.

Introduced on Oct. 30, Sprint Spark combines spectrum capacity and advanced network technologies and is expected to deliver a seamless tri-band LTE experience, including wireless peak speeds of 50-60 Megabits per second today on capable devices, with increasing speed potential over time. Sprint further states that, given it’s spectrum and technology assets, it is technically feasible to deliver more than 2Gbps per sector of over-the-air speed.