A GSM PLMN may be described by a limited set of access interfaces and a limited set of GSM PLMN connection types to support the telecommunication services described in the GSM 02-series of specifications.
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This aggregation of circuit-switching telephone networks has evolved greatly from the days of Alexander Graham Bell, and in the late 20th century became almost entirely digital in nature — except for the final link from the central (local) telephone office to the user (the local loop).
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Application messages are commands or data exchanged between an application resident in or behind the GSM PLMN and on the SIM.