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When the common European GSM standard was introduced, operators used it to promote roaming between European countries and then later worldwide. By offering transmission over a continuous connection, the GPRS standard has significantly increased speeds for data transmission. Until GPRS was introduced, mobile operators had only partially installed bridges between their switched networks and data networks. The purpose of this document is to illustrate architectures for GPRS roaming and aims to provide a standardised view on how GPRS networks can interwork in order to provide GPRS roaming capabilities when users roam onto foreign networks.