How do I find how many GB my iphone 5 has without a Sim Card?

Hi --

 

I have a friend who has given me their TMobile UK iPhone 5, after I destroyed mine.

 

I cannot get it unlocked to use in the states so I am selling it.

 

I want to find out how many GB it has. I don't have a sim card for it. It looks like the roadblock is not having one.

 

Is there a way for me to run a diagnostic on it without having a sim card to determine how many gb it has?

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