Here’s the main thing you need to know when planning a switch. It’s not the hardware. Buying a new smartphone is the easy bit. It’s moving your data and getting replacements for all those apps and services you use that is the bit that will have you tearing your hair out. Digital ecosystems are strange things in that you don’t really start to feel the boundaries until you’re already walled in, and by then it’s usually too late — or at least close to being too late — to do much about it.