MARTY YAWNICK, LIFE IN LOFI:
"Whether to mount and frame as gifts, for sale or for gallery exhibition, more and more users want to print photos from an iPhone. Prints and enlargements can be made from any iPhone camera. How big an enlargement you can make depends on a number of factors – the iPhone model you use, the resolution of the apps you use, and if, how and where you are willing to resample your images."
Read more, here.