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I dropped my iphone 6s plus a month ago due to which the screen have several cracks and a small piece of the phone broke that i could see the chip inside and now it suddenly has pink and blue lines. How much would the repairment cost and can someone tell me how to get it fixed? I want the apple company fix the screen

Apple charges $169 for screen replacements - $29 if you have AppleCare. See this link about pricing and getting the process started to have Apple perform the repair: https://support.apple.com/iphone/repair/