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Got my smashed iPhone 6s screen fixed. However the touch input is not fully working I.e the text is jumpy when I type also the resolution isn’t great? What could be the problem pls help

It’s not your phone, it’s the parts the repair tech used. It’s called ghost touching. It even happens from the parts I use, from time to time. The shop should honor a warranty, it’s supposed to be free for you. If they give you a run around, threaten em with bad Google review, they’ll straighten up right away