: Consolidating GSM Phase 1 and Evolving the Services and Features to GSM Phase 2 in ETSI SMG (1992–1995) Philippe Dupuis 1 4.1 General When the agreement on the selection of the GSM technology had been achieved some people thought that the rest would be easy. We knew however that producing a set of specifications that would ensure the interpretability of mobile stations produced by any mobile terminal manufacturer, and network infrastructure produced by any manufacturer of network infrastructure