Editing GSM frequency bands (section)

=== GSM-900, EGSM/EGSM-900 and GSM-1800 ===
GSM-900 and GSM-1800 are used in most parts of the world (ITU-Regions 1 and 3): [[Africa]], [[Europe]], [[Middle East]], [[Asia]] (apart from [[Japan]] and [[South Korea]] where [[GSM]] has never been introduced) and [[Oceania]].

In common GSM-900 is most widely used. Fewer operators use GSM-1800. [[Mobile phones on aircraft|Mobile Communication Services on Aircraft]] (MCA) uses GSM-1800.<ref>[http://europa.eu/rapid/pressReleasesAction.do?reference=MEMO/08/220&format=HTML&aged=1&language=EN&guiLanguage=en EUROPA - PRESS RELEASES - Press release - Commission Decisions on Mobile Communication Services on Aircraft - Frequently Asked Questions]. Europa.eu. Retrieved on 2013-09-18.</ref>

In some countries GSM-1800 is also referred to as "Digital Cellular System" (DCS).<ref>{{cite conference |last1=Ramsdale |first1=P.A. |last2=Hadden |first2=A.D. |last3=Gaskell |first3=P.S. |title=DCS1800-the standard for PCN | conference=1991 Sixth International Conference on Mobile Radio and Personal Communications |date=December 1991 |pages=175–181 |url=https://ieeexplore.ieee.org/document/140234/}}</ref>