Group 1 - AT&T Inc. is recognized as a promising stock under $100, with recent developments indicating growth potential [1] - The company has expanded cellular connectivity for riders in the New York City subway system, specifically in the Joralemon Street tunnel [2][3] - This expansion is part of a major wireless upgrade for Brooklyn's transit system, making AT&T the first carrier to provide wireless service in these newly wired tunnels [2] Group 2 - The Joralemon Street tunnel, which is 1.1 miles long, connects the 4 and 5 subway lines between Manhattan and Brooklyn, enhancing mobile service for riders [3] - Future connectivity upgrades are planned for the crosstown G line segments, further improving service for commuters between Queens and Brooklyn [3] - AT&T operates through two segments: Communications and Latin America, indicating a diversified business model [4]