How to Photoshop an image to fit an iphone 4s screen but keep its quality?
How can i Photoshop an image to fit an iphone 4s screen but keep its quality because it stretches to much - this is what the picture looks like when photoshped to iphone 4s screen size just to strecthed 
You're going to need to crop it rather than resize it. You will cut off some of the sides of the picture, but that will eliminate the stretching.
Don't stretch or squeeze it, just take part of it away instead (preferably an equal amount from each side).
If I word this any other way it's a copy of Dustin's answer, but I just wanted to provide some help as well.
Make it at the correct pixel size to begin with 
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