Wireless carrier connection issues

I've been unable to connect to my wireless carrier...can only get online via WiFi.  I went into settings and see it says "no sim" in the ICCID field.  Should there be a SIM in my iPad?  If so, could this be my connection problem?

Yes, the cellular connection requires a sim as that is what holds the information for your account with your carrier.
If you've never inserted a sim or did not setup the iPad with a wireless carrier, you'll need to do so to get a sim.
Otherwise there should be a sim inside which may have moved and lost connection, or simply failed as is known to happen.
You can open the sim card tray with the provided tool, and see if its there. If it is there, and reseating it on the tray and closing the tray again does not bring the cellular connection back you may need to contact your carrier to get a new sim.

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