Smartphone Help: iPhone 4s SIM Card?

I have an iPhone 4s. It has never given me problems, but for the past two weeks it keeps alerting me "SIM FAILURE" and on the top left side where the bar signals and provider are displayed, there's a "SIM FAILURE" instead. I have tried restarting the phone, removing the SIM card and placing back in, this usually works fine for about 2-3 days and then the same problem occurs. Do I need to replace the SIM card? What are the price ranges for this? I'm looking to upgrade in December to a new phone, and not sure if worth spending $$$ on a SIM card.

Any suggestions?

This is not a true post. The iPhone 4s does not have a SIM such as you describe.

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