Whenever I put my iPhone 4 between my cheek and shoulder ( if I needed to write something down for example). No matter what, the phone will drop the call. Its not a proximity sensor because I get a call failed message. Case solved my death-grip issue, but not this one. Hadn't seen anything mentioned about it, wondering if its just mine....
No signal drop to speak of when it happens either.
No signal drop to speak of when it happens either.