Is that the iPhone 6? I see that it fits, but does it make it difficult to zip around with the phone in it? I would like to perhaps use it for the same purpose but I don't want to if it's going to stress the zipper too much....
It is the iPhone 6, and I think it fits great. I know some people really don't want any bulge AT ALL, and don't want to stuff wallets. I am not really one of those people. I don't want my things warping terribly and looking awful. But I also cannot fathom storing items in their dustbags while in my bag, for example

I fill all card slots and carry a small amount of cash and coins. Besides that I have a few receipts and some photos in my wallet. With this amount of stuff, I find the phone fits fine. It's a tight fit, but not forced.
If you only placed card on one side of the wallet, and if there were no coins at all, I think the fit would be even better.