“…In an early cross-country study, Ahn, and Lee (1999) uncovered a complementary relationship between fixed and mobile telephony. These findings were echoed in subsequent research for African (Hamilton, 2003) and Central European OECD (Gruber, 2001) provide evidence in support of substitutability between fixed and mobile telephony for both advanced (Garcia-Marinoso and Suarez, 2013;Rodini, Ward, & Woroch, 2003;Srinuan, Srinuan, & Bohlin, 2012) as well as in diverse emerging markets, such as Korea (Sung, & Lee, 2002), Egypt (Gelvanovska, Rogy, & Rossotto, 2014) and India (Gupta, & Jain, 2012. Recognizing the possible endogeneity between mobile phone penetration and economic growth, recent studies have addressed this deficiency by using system GMM estimator, as in Lee, Lavendis, and Gutirrez (2009).…”