My phone
My phone has colorful lines across it and the left side of my screen doesn’t work and is cracked
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Make a Genius Bar appointment at the nearest Apple store to have the screen replaced. Costs vary depending on location. See this link. iPhone Screen Repair & Replacement - Official Apple SupportIf you do not have an Apple Store close by, use this link to contact Apple Support and see about mail-in service. Contact Apple Support
Depending on the age of the phone, you might also consider a new device, rather than putting money into an older one.