But there always comes a time when people take photographs and then compare their efforts to what a professional or highly skilled amateur can do. There is a difference in what they see. And then they start to ask questions, like why are their photographs so much better? At that point they suddenly become disenchanted with their mobile phone camera. It seems like an inferior machine. The photographs that were once great are now embarrassing. Hello, DSLR.
That's certainly what I did - and how I got started!
(except it wasn't with my phone, it was with my P&S)