Q: Why has the screen on my 5s gone three quarters grey?

Hi charnz87,

Thanks for using Apple Support Communities. Based on what you stated, it sounds like most of the screen is now grey. I would recommend that you read this article, it may be able to help the issue.

Get help with the screen on your iPhone, iPad, or iPod touch - Apple Support

 

1. Try to restart your device. If you can't restart, reset your device.
2. If restarting or resetting doesn’t fix the issue, restore your device.
3. If you still see the issue after you restore, contact Apple Support.

Cheers,

Mario