I have been having a problem calling out on my Blackberry 8520. Every time I call a number an icon with the phone symbol, two arrows going in opposite directions and a headphone symbol appear, the person that I am calling will answer but on my end of the phone it will “skip” and neither one of us can hear the other. The texting works fine. Ive tried taking out the battery and sim card, an update and a backup restore but it still does it. Any Ideas?