There are proximity sensor issues recently noticed on the new white iPhone 4 with two cases so far. When the white iPhone 4 minus a screen protector is placed in an Otterbox Defender and the Griffin Survivor the proximity sensor does not work at all. The call screen remains on even when a finger is covering it entirely. This seems to be due to the plastic film that is covering the sensor preventing it from working properly. When the plastic that covers the proximity sensor is removed it works fine, the screen disables like it is supposed to when on a call. We tested the black iPhone 4 in both of the cases with the plastic film still covering the proximity sensor and the screen disabled as it is supposed to. Have you had these issues? Have you used another brand case with the same issues? Leave a comment and let us know.
Update: The front invisible shield by Zagg is causing the proximity sensor on the white iPhone 4 not to work at all. I am using an anti-glare screen protector by iFrogz on my white iPhone 4 and have no problems at all.