Chosen Solution

What is the best way to tell the difference if the iPad (original) I have in my hands is a GSM or CDMA?

The GSM iPad will have a SIM card slot, a CDMA iPad will not. I wasn’t aware of a CDMA iPad 1st Generation, but CDMA technology doesn’t use SIM cards.

Where is the SIM card slot? Where would it be if we had one?