Q: ihone sacreen turns blue

Good day sumitbharti,

If you are getting a solid blue screen when you connect your iPhone's headphones, I would suggest that you troubleshoot using the steps in this article - Get help with the screen on your iPhone, iPad, or iPod touch.

Specifically this section -

If you see a solid color screen (black, white, or blue)

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. Force restart your device while it's plugged in.
3. If this doesn't work, restore your device.
4. If you still see the issue after you restore, contact Apple Support.

Thanks for using Apple Support Communities.

Safe computing.