Q: half of the screen isn't working and i can't unlock my phone.

Hello there, ragh77.

It sounds like your iPhone touchscreen isn't responding to touch. The following Knowledge Base article provides a thorough checklist of recommendations for troubleshooting:

If the screen on your iPhone, iPad, or iPod touch doesn't respond to touch - Apple Support

Fix your touchscreen

Make sure your hands are clean and dry, then try these steps:

1. If you have a case or screen protector on your device, try removing it.
2. Clean the screen with a soft, slightly damp, lint-free cloth.
3. Unplug your device.
4. Restart your device. If you can't restart, force your device to restart.

If your touchscreen still doesn't respond like it should, contact Apple Support or take your device to an Apple Retail Store or Apple Authorized Service Provider.

Thank for being a part of Apple Support Communities.

Kind Regards.