iPhone stopped working after iOS 9 update

p.s. you can

How to back up your iPhone, iPad, and iPod touch

then

Restore your iPhone, iPad, or iPod to factory settings

Set up as new phone and test it then

restore from backup.

https://support.apple.com/en-us/HT204184

Johnbln ~ As you haven't mentioned already trying this, Apple's iPhone User Guide says: "If your iPhone isn’t working right, try restarting it.":

Restart iPhone

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We didn't, we are users like you.

If you left automatic updates on then you updated it.