The communication services sector is composed of companies that focus on connectivity and is a favorite of long-term investors as it is resilient to market cycles and somewhat reliably predictable. The sector includes internet and phone providers. Three of these largest U.S. telecommunications companies by market cap are T-Mobile US Inc. (TMUS, Financial) ($208 billion), Verizon Communications Inc. (VZ, Financial) ($171 billion) and AT&T Inc. (T, Financial) ($134 billion). The purpose of this analysis is to ...