IPhone 4 touchscreen not working?

My phone screen cracked so I ordered a new one and replaced it but now the touchscreen capabilities are not working. Is there anything I can do to fix it or is it just a faulty screen? I looked up some reviews and no one seems to have the problem I do.

Did you try turning it off and turning it back on

Better to take to it to Apple service centre They will help you.

First, try to increase touch efficiency through internal setting, if no clue then go on care center.

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