When at home, I alternate between my phone, and my chair. When on the phone, I lie down and scroll, which fixes any issues I had sitting, and repairs my back before I sit down again. The only caveat to this is my phone is a consumption device and nothing productive ever gets done on it, apart from the odd teleconference.
For offices, I've heard many of the trendy offices have bean bags so you can comfortably use your device.