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"Wireless carriers in Americas already receiving benefits of GSM/GPRS Technology" (18 February, 2003) Retrieved from http://www.portel.it/news/VPOnews.asp?id=382
Cellular Communications
Whelan, Carolyn. (2 March, 1998) "CDMA vs. GSM - Code Division Multiple Access faces Competition from European Global Standard for Mobile Communications in Wireless Market - Technology Information" Electronic News. Volume: 8; No:1; pp: 21-24 \001
Cellular Communications
"Network Aspects of the GSM System," (c) Jan A. Audestad, published in "Eurcon 88," June 1988.
New Computer Technologies
"GSM Network Systems and Overall System Integration,"(c) M. Feldmann and J. P. Rissen, published in "Electrical Communications," 2^nd Qtr, 1993.
New Computer Technologies
Mobile-Review - "Review GSM phone Sony Ericsson K750i, Samsung D500, and Motorola A780". Retrieved on May 27, 2006, from www.mobile-review.com
Mobile Phone Comparison
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