* Class A- The GPRS/EGPRS MS may have a CS connection and a GPRS/EGPRS transfer at the same time.
* Class B- The GPRS/EGPRS MS may be GPRS and IMSI attached simultaneously but it cannot use both services at the same time.
* Class C - The GPRS/EGPRS MS is only allowed to be attached to one service at a time. A GPRS/EGPRS MS that only supports GPRS/EGPRS and not CS traffic will always work in class C mode of operation.
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