Ian and I don't speak with one voice (that's why we have two hosts!), but we at Outerfocus agree that understanding photography is more important than equipment, and that buying photography books is a better use of money than constantly "upgrading" your equipment.
It doesn't matter what you shoot with. All that matters is the final image. You don't have control of depth of field, cameras make larger files and have expanded dynamic range. Despite having cameras that make huge files, most of the framed photos in my house were taken with either film or my iPhone because that's what I have in my pocket.
At first, I didn't take the phone seriously because it's just a phone. My photographs with it were terrible for a long time. My preferred focal lengths are the 35mm and 50mm and the iPhone is close to about 28mm. The images from the iPhone 3 and iPhone 4 look like paintings now because of the low resolution. but something happened once the iPhone 5 was released...
Below the images below is a link to my website gallery of some of my favorite iPhone images (I had to limit gallery size for SquareSpace speed reasons) over the past two years. Taken with the phone and processed with the phone. Some of them are lower resolution when I couldn't find the original file.