Virtual Roaming Systems for GSM, GPRS and UMTS: Open Connectivity in PracticeE-bookVirtual Roaming Systems for GSM, GPRS and UMTS: Open Connectivity in PracticedeArnaud Henry-LabordereNota: 5 de 5 estrelas5/5Salve Virtual Roaming Systems for GSM, GPRS and UMTS: Open Connectivity in Practice para mais tarde