Hi!

I´ve having som trouble with the mic on iphone 4. Suddenly my shop have had like 10 customers with the same problem within a week. The microphone doesn´t work during calls but works fine with skype, viber, voicememo and so on. What i have heard it´s because bad solder when the phones was made. But i can not understand why this problem shows now? what do you think? some customers claims the problems came after a software update in itunes.