I think it's worth noting here that the hard restart sequence for the iPhone7/7+ is different than prior iPhones. You hold the power button and volume down for about 10 seconds (until the apple logo appears) to get the phone to restart. This is due of course to the differences with the home button.
I've read in several forum threads about people asking if they can get notifications of both their iPhone and Apple Watch at the same time, and a lot of the answers are no.
However, I just turned off Wrist Detection on my watch and had a friend send me a text message. I got audio and vibration notifications on both my iPhone and Watch. Is should also be said that by turning off Wrist Detection you will lose a lot of features of the watch like some health info and pedometer. I don't know if this is specific to the 7 Plus as that's all I have access to at the moment.