Making messaging on the watch with a separate cellular connection work seamless with messaging on the phone is an amazing symphony of cloud services. Apple is c

Making messaging on the watch with a separate cellular connection work seamless with messaging on the phone is an amazing symphony of cloud services. Apple is currently, IMHO, the only company with the cloud service ability to pull this off. Google Voice is a close second, but that hasn't been moved forward in quite awhile. It is amazing how hard multi-homing has ended up being. Facebook Messenger has it working correctly, and the new chat apps that store all state in the cloud, e.g. Slack or Microsoft Teams, also pull it off. Maintaining reasonable battery life with an always on LTE is also to be commended. Wireless is a huge power drain, providing low latency, low power, messaging is hard. FWIW, just having an LTE chip that never needs to turn on is easy, a fresh install of any mobile OS with no messaging apps installed will last for days. Put a single app that needs real time(ish) messaging delivery on board and watch the battery life drop in half.