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My problem was that my Wifi on my iphone 4S was grey... So i decided to open my Iphone 4S and replace the Wifi/Bluetooth antenna with a *new* one! From Ifixit! And it really works! It works like a charm! Really good! very good quality though !
The repair was really NOT difficult.. You just have to open your back case. And screw of the vises that you need to unvise. You do NOT need to take all the parts of.. Only the part where it's located in your phone.
My advice is to look very good what your doing! I mean by that... Be focused on your work you do on your phone.. Because if you miss one vise.. It could ruin your phone... So be patient, and put all the vises and parts on a small magnet board that you can purchase here on Ifixit!