From iOS to Android - NO; from iOS to Windows Phone - MAYBE. Love NOKIA stuff almost equally to iPhone as hardware is concerned. To me most important: call reception/call quality, camera, audio. Not important to me is the number of apps available -- I always end up using 4 to 5 same apps and they are usually available on other platforms. I'd also like to try the new Blackberry that's coming up, but not considering it as an option. However, iPhone 5 still has a slight edge for me.