https://www.rohde-schwarz.com/lat/tecnologias/celular/gsm-egprs-edge-evolution-vamos/gsm-egprs-edge-evolution-vamos/gsm-egprs-edge-evolution-vamos_55921.html
GSM (Global System for Mobile Communications) networks have been deployed worldwide as second-generation mobile communications systems.
edge evolutiongsmegprsvamostechnology