ideas????

so I put a selfie of myself on fb using my mum's iPhone to take the photo infront of a mirror (so u can see the iPhone in the picture) and my friend commenté saying

'how come when eva u take a photo of ur self its always on ur mums iphone??? :)'

she has a dit it before and it's meant to montrer people that it's not my phone, i don't know why she does it so can toi just please help me with a good comeback that's not rude ou mean?