Virtual Roaming Systems for GSM, GPRS and UMTS: Open Connectivity in PracticeeBookVirtual Roaming Systems for GSM, GPRS and UMTS: Open Connectivity in PracticevonArnaud Henry-LabordereBewertung: 5 von 5 Sternen5/5Virtual Roaming Systems for GSM, GPRS and UMTS: Open Connectivity in Practice für später speichern