The class indicates the mobile phone capabilities.
Class AClass A mobile phones can be connected to both GPRS and GSM services simultaneously. Class BClass B mobile phones can be attached to both GPRS and GSM services, using one service at a time. Class B enables making or receiving a voice call, or sending/receiving an SMS during a GPRS connection. During voice calls or SMS, GPRS services are suspended and then resumed automatically after the call or SMS session has ended. Class CClass C mobile phones are attached to either GPRS or GSM voice service. You need to switch manually between services.
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