Just give them the IMEI number of your phone. It should't matter that they don't have the IMEI of the phone in their system. Although GSM carriers, for some reason, often ask for the IMEI, they don't actually have to have it and don't always require it. I believe in many cases, they are only trying to verify that the phone is compatible with their network.
The difference, perhaps oversimplified, is that GSM uses the serial number of the SIM to determine who is authorized to use the network, whereas CDMA carriers need the ESN (similar to the IMEI) of the phone to determine if that phone can use the network.
It should be that simple, but AT&T takes simple and makes it painful. AT&T does require the IMEI to make sure the device isn't stolen at first, then they use that to register the device. If it isn't in their system (in other words, they don't sell it themselves), they throw a fit. Phone reps aren't allowed to activate it due to fraud prevention and they force you to go to a corporate store to do it. Unfortunately, their store reps are usually incompetent like every other carrier's store reps.
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