This week, 4 Wireless Telecommunication Services stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Rogers Communications Inc. Class B (RCI) experiences a ratings drop this week, going from last week’s C to a D. Rogers Communications Inc. Class B is a communications and media company in Canada. For more information, get Portfolio Grader’s complete analysis of RCI stock.

United States Cellular Corporation (USM) slips from a D to a F this week. United States Cellular Corporation is a wireless telecommunications service provider. The company also gets F’s in operating margin growth, earnings growth, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of USM stock.

Vodafone Group Plc Sponsored ADR (VOD) is having a tough week. The company’s rating falls from a D to a F. Vodafone Group Plc Sponsored ADR is engaged in providing voice and data communications services for both consumers and enterprise customers, with a significant presence in Europe, the Middle East, Africa, the Asia Pacific region, and the United States. The company also gets F’s in operating margin growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of VOD stock.

America Movil SAB de CV Sponsored ADR Class L (AMX) gets weaker ratings this week as last week’s D drops to a F. America Movil SAB de CV Sponsored ADR Class L provides wireless and fixed-communications services throughout Latin America. The company also gets F’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of AMX stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.