Bad iPhone 4s Cellular signal after drop

Hey all,

I recently dropped my iPhone about 2 feet unto the sidewalk. I had a LifeProof case on, so no outer damage is visible. Unfortunately, since that day, at first, I had full signal but no internet access. And soon after, my signal came down to 0 or 1 bars most of the time, but I had internet access.

Same iPhone's from verizon get 3-5 3G/4G signal at home. Mine gets 0-1.

The phone has been once dropped in water, so I have replaced the dock connector in the past since the speakers weren't working because of a mold build-up on one of the pins. I have also replaced the cellular antenna, in attempt to fix this signal issue. That has not worked. I have cleaned the metal prongs of the cellular antenna cable, but no change has been noticed.

Any help would be greatly appreciated, I can upload photos of my phone's interior if need be.

Thanks!