How to know the GB of iPhone 4 without turning it on?

I have an iPhone 4 for AT&T. I don't have a SIM card and so it doesn't let me go to the home screen. It hasn't been set up yet and it won't let me go through setup without one. I can't seem to find any indications of it in the back anywhere either. Is there a way to find out from the numbers on the back? Or some other way I don't know about?

Trying to sell it but don't know the proper GB to list.

Please and thank you!

If you could check the serial number it maybe able to tell you that info. The last letter tells you what capacity.

S for 16GB
T for 32GB

Not sure what it is for the 8GB model but if it isn't either S or T then it should be whatever it is for 8GB.

If I remember correctly that number maybe on the SIM tray.

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