My iPhone won't download or update apps?

I have an iPhone 6S and everything software wise is up to date. However, when I try to download an app, a new application bubble appears on my phone, but it doesn't begin to load. It's just stuck in the "waiting" process. Also, my updates don't go through. I click update all or just update and the circle that shows load time, doesn't load at all.

So that's that.

Power it down completely by holding down the sleep wake button for 20s or so. Then restart, log in and try again.