Answer to: The numbers keyboard and several other buttons do not work properlyThis happen when you spill liquid on the keyboard, you will have to replace the whole keyboard to solve this problem.
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Answer to: iPhone 4S keeps searching after screen replacementIts a time date issue, I used the wifi to set the time and date and it worked fine for me . But if you made errors when removing the phones motherboard, you might be having a hardware issue. Try first to check if the time and is set at 1970 if it is, then u get the constant searching problem.