Why do my phone calls sound weird?

I have an iPhone 6 plus, not 6s but regular 6 plus and I just 2 days ago updated my phone to iOS 10. Since I updated my phone my phone calls have sounded weird, it almost sounds like I'm trying to talk through a tin can. Before the update my phone sounded completely fine. Why did this happen to my phone? Was it the update that did this, if so how can I fix it?

Low on storage (iPhone 6s)?

My phone has been low storage for like 7 months. And I keep getting those notifications, I deleted so many apps since than and my storage is still so low. I have Apple Music that takes up 1GB but other than that I don't have much WTF

Iphone health kit recording way too many steps?

I have a fitness watch with a corresponding app. I also have an app that tracks the distance of my runs and estimated calories burned, and another app that tracks how many calories I eat. I went on a 3.5 mile run this morning, and my health kit on the iPhone is saying I've taken 16,000 steps. There's no way. Are all of my health-related apps adding up the steps they separately record? How can I change this? My watch, which i never take off, says I have taken about 9,000, which sounds more accurate.

What could be done about this?

My iphone screen popped out of it's frame pretty bad and i'm wondering whether to do something about it myself or send it to a repair shop. What could be done about this