I used it when I had an iPhone 4 and it fit that. I tried my iPhone 5c in it and it fit as well, but I only have a thin case on mine. I don't think a phone with a big, heavy duty case such as an otter box would fit. And not sure if a samsung galaxy or whatever would fit...don't know if it's a lot wider than an iPhone. I can check the dimensions on the case and post that when I get home.