I am using a iPhone 6 but it has got red screen

Hello sarzinafromnew york,

Thanks for using Apple Support Communities.

To help resolve this issue where you only see a red screen on your iPhone, please follow the steps outlined below.

1. Plug in your device to a power source. If you see the low-battery screen when you plug in, let your device charge for at least 10 minutes (20 minutes for iPad) before using it.
2. Reset your device while it's plugged in.
3. If resetting doesn’t fix the issue, restore your device.
4. If you still see the issue after you restore, contact Apple Support.

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

Have a good one,

Alex H.