IPhone buttons don't work at all

My iPhone had all of a sudden broke! My home button, power button, volume up and down are all not working. When I can get into my phone it's all fine! Just the buttons don't work. I have updated software and done re set. Any other suggestions?

Reboot. Try holding power + home + down volume.

If that doesn't work, reset it. Go to Settings > General > Reset Settings.

If that doesn't work, call Apple, hopefully it's under warranty.

Take it into the Apple store if it's still in warranty and they'll fix or replace it for free.