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The proximity sensor on my Galaxy S4 stopped working, whenever I took a call the screen would shut down and won't come back on again, I discovered it had a lot of lint and dirt blocking it, I hope this video helps people with similar problems. UPDATE: Here is the link to Amazon for the toolset I use in this video: http://www.amazon.com/Olympia-Tools-88-670-15-Piece-Repair/dp/B008CLO7Q2/ref=sr_1_3?ie=UTF8&qid=1422889599&sr=8-3&keywords=iphone+tools&pebp=1422889603890&peasin=B008CLO7Q2