Iphone 4s has flickering screen and green wavy lines across it?

Had my iPhone about a month and in the last few days there's been green wavy lines across the screen at random points depending on which app i'm using, and there's a slight flicker at the bottom of the screen? For some reason this doesn't happen when it's charging though? Any idea how I can fix it?

Sounds like it is getting ready to die. Have you dropped it? If it is still under warranty contact apple about having it repaired or replaced.

Contact phone company, and get it replced

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