Can a store scan read a barcode off my iPhone?

If I have a coupon with the barcode on my screen could they scan it in a store?

They can't scan it, but they can put the number (bottom of barcode) into the computer. I do it all the time when I go to the grocery store.

They should be able to. If they couldnt then there wouldnt be a coupon for that store on your phone.