Iphone 13 pro display suddenly turned yellow
iphone 13pro display suddenly turned yellow could not open anything
Question marked as
First try a Forced restart Force restart iPhone – Apple Support (UK)
If no better you should arrange a repair
iPhone Service & Repair - Apple Support
Or
Contact - Official Apple Support
Anything other than Screen or Battery may be a replacement phone and the price is in the article under "Other damage"
See also: Get your iPhone, iPad, or iPod touch ready for service - Apple Support