My friend sent a pic of herself that she took with her camera to my phone while I was on my way to lunch with her. She then told me that she sent the pic by accident and could I please delete it because it's embarassing. Now, I'm pretty confident it's not anything gross, but I'm just really curious. Anyway, my question is not whether or not I should open the pic (I'm pretty sure the answer is "no" but I'm going to do it anyway) but whether she can tell that I've opened the pic from my phone? Or does it depend on the phone? Also if you want to dissuade me from opening it, that too.
ETA: This was really just a specific question about cell phone technology and not about whether I should open a picture and put it online.