Not really. The way I have modelled this is pretty similar to how I do most non-organic stuff, just it's more involved, like, I've had to have more patience. I'd say if there's one tutorial more than any other that taught me how to model hard stuff, it's the apache one off this site. I always think of that tutorial as the one that really taught me to understand edge looping, and edge flow, to get smooth edges. For this phone though, there's nothing really too tricky I would say. It took me a few attempts to start with, but once Id reminded myself how to use the bevel tool (and that it existed, generally) I was away. Thats how I did the wide smooth corners on the main thumb pad bit in the middle, and at the four corners of the phone as a whole. The rest was just common sense stuff.