This week, the ratings of 3 Wireless Telecommunication Services stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, United States Cellular Corporation’s (USM) rating worsens to a D from the company’s C rating a week ago. United States Cellular Corporation is a wireless telecommunications service provider. The company also gets F’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of USM stock.

TIM Participacoes S.A. Sponsored ADR (TSU) declines this week from a C to a D. TIM Participacoes S.A. Sponsored ADR is a mobile telecommunications services provider in Brazil. The company also gets F’s in earnings growth, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of TSU stock.

America Movil SAB de CV Sponsored ADR Class L (AMX) slips from a D to a F this week. 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 sales growth, earnings revisions, and earnings surprise. 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.