I took my sims card out if my iPhone 4s to get the serial

I took my sims card out of my iPhone 4s to find the serial # and when I put it back in my phone says I do not have a sims card. Can anybody help me?

Why do you have to take the SIM card out for serial number?
The iPhone serial number can be found in
Settings > General > About > Serial Number > here.

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