My iPhone continually shows me an Invalid SIM message or SIM Failure.  If I switch my phone off and then back on it works ok for a maximum of 10 mins, and then I get the same message appearing.  How can I resolve it?

My iPhone 4S keeps on giving me an error message about my SIM Card.  It either tells me invalid SIM or SIM Failure.  The only way i can rectify this it to switch my phone off and then back on again, but this resolve only lasts for 10-15 Mins, and then the same error message appears.  Any ideas on the best way to rectify my alleged SIM card issues?
Many Thanks

i Had a simular issue years ago with my blackberry on ATT.  As it turned out, my SIM had some issues.  I would head over to your carrier and get a free sim replacement.   It could be a phone or SW issue, but the Sim is my first guess give my experience

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