The ratings of 5 Diversified Telecommunication Services stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

ATN International, Inc. (ATNI) is having a tough week. The company’s rating falls from a C to a D. ATN International, Inc. is a provider of wireless and wireline telecommunications services in North America and the Caribbean. The company also gets F’s in operating margin growth, earnings growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of ATNI stock.

This week, China Telecom Corp. Ltd. Sponsored ADR Class H (CHA) drops from a C to a D rating. China Telecom Corp. Ltd. Sponsored ADR Class H is an integrated information service provider that offers telecommunications services, including wireline voice services, mobile voice services, and Internet access services. For more information, get Portfolio Grader’s complete analysis of CHA stock.

This is a rough week for Inteliquent, Inc. (IQNT). The company’s rating falls to D from the previous week’s C. Inteliquent, Inc. provides a range of voice, data, Ethernet and hosted services to customers based in more than 80 countries across six continents. For more information, get Portfolio Grader’s complete analysis of IQNT stock.

magicJack VocalTec Ltd. (CALL) experiences a ratings drop this week, going from last week’s C to a F. MagicJack VocalTec Ltd. provides voice over Internet protocol services over various platforms. For more information, get Portfolio Grader’s complete analysis of CALL stock.

Frontier Communications Corporation (FTR) gets weaker ratings this week as last week’s C drops to a D. Frontier Communications Corporation provides communications services to residential and business customers in rural areas and small and medium-sized towns and cities in the United States. The company also gets F’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of FTR 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.