Answer to "iPhone 5 microphone not working during calls"Hi Sumit, i assumed you only use 1 piece of spare part. try other pieces and check if it working again. sometimes spare parts do malfunction/defected.
Answer to "My touch screen doesn't work"Replace the screen.do not try it yourself if you are beginner.iphone 4 screen replacement need some set of skill to replace.
Answer to "wifi is greyed not working after restore"Hello, This wifi grey for iPad 95% due to malfunction of wifi port/board "''something that connect the wifi cable network"it is small board in the main PCB. change this port/board and your problem solve like forever.http://postimg.org/image/tkrzc35nr/