pisendar

Hey guys.I have iphone 4G . version 4.0.1 With my old iphone 3G i would perfectly hear anybody and they would hear me as well. Since i got iphone 4G .... I notice people cant really hear me. i have to scream repeat myself few times by screaming. Maybe it is because of the phone, or anything ... Please let me know if someone have the same problem or FIX ... thank you