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, Philippine Long Distance Telephone Co. Sponsored ADR (PHI) drops from a D to a F rating. Philippine Long Distance Telephone Co. Sponsored ADR provides domestic and international long distance and cellular telephone services. For more information, get Portfolio Grader’s complete analysis of PHI stock.

Slipping from a D to a F rating, America Movil SAB de CV Sponsored ADR Class L (AMX) takes a hit 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.

This is a rough week for Turkcell Iletisim Hizmetleri A.S. Sponsored ADR (TKC). The company’s rating falls to F from the previous week’s D. Turkcell Iletisim Hizmetleri A.S. Sponsored ADR offers cellular telephone, voice and data communication services through its GSM network in Turkey. The company also gets F’s in sales growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of TKC 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.