My iPhone 4S lost simcard reference several times a day and issue message invalid SimCard. I have already replaced simcard three times and not solve the problem. It's necessary to power off and power on to solve it. Could someone help me?

My iPhone 4S lost simcard reference several times a day and issue message invalid SimCard. I have already replaced simcard three times and not solve the problem. It's necessary to power off and power on to solve it. Could someone help me?

Return your phone to Apple for evaluation

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