By MARC ALESSI // It’s no secret that Long Island has problems with cellphone service. More than 200 cellphone “dead zones” were identified in late 2016, as well as poor-quality network speed, reliability and performance. U.S. Senator Chuck Schumer (D-NY) has even urged carriers to improve coverage on the Island. As a longtime resident of the North Shore, I have witnessed firsthand what it means to not have reliable wireless connectivity with our mobile-enabled electronics….