Abstract: This study aimed at investigating the influence of atmospheric parameters on GSM outgoing calls quality. Total of 132 calls were made from the month of December 2007 to November 2008. The atmospheric parameters viz rain fall affect GSM outgoing call quality with minimum average of 29.28% in July 2008 and maximum average of 53.73% in August 2008, dusty whether with minimum average of 28.40% in December 2007 and maximum average of 34.73% in the February 2008. The study shows that atmospheric parameters have great impact on GSM outgoing calls quality.