A GPRS roaming exchange (GRX) acts as a hub for GPRS connections from roaming users, removing the need for a dedicated link between each GPRS service provider. It was developed to facilitate a more efficient way for operators to interconnect networks, and played a large part in the transition to third-generation systems.
Read more about GPRS Roaming Exchange: Development, Technical Implementation
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—Henry David Thoreau (1817–1862)