Development
Initially GPRS roaming was based on complicated relationships between individual operators with each operator requiring a dedicated link to each different partner so that, whereby is the number of global operators that would require a dedicated link. This meant that mobile subscribers who wanted to use GPRS whilst roaming could only do so if their operator had a direct agreement with the operator in the country or area in which they were roaming.
In 2000 the GSMA (GSM Association) developed the idea of GRX to handle all roaming between public land mobile networks (PLMNs).
Read more about this topic: GPRS Roaming Exchange
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