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This communication presents a study showing that cellular phone usage duration have got a significant effect on the power control in mobile cellular networks. This is because the long-time operation (transmitting and receiving) of the cellular phone radio hardware cause the wearing-out of radio elements. Hence, the operation of worn-out radio elements introduces power control errors and this degrades the performance of the power control algorithms. And this result in poor power control of the excessive transmitted power, hence the interference caused, compels a handset to violate the EMC regulations. This degrades the quality of the mobile cellular services. The paper also presents a derived power control performance model for a handset.Index Terms-Power control, mobile cellular networks, cellular phone usage duration, worn-out radio hardware, performance degradation, interference, EMC regulations, quality of service (QoS) .