I saw this story over at 9to5mac.com this morning and I wanted to share. This story was posted today, but I'm not sure how relavent it is because it does say 4.1 shows promise, but I've heard mix stories from people who have the 4.1 beta installed on their phones.
http://www.9to5mac.com/23198/where-is-the-iphone-4-proximity-sensor-patch""Apple Australias chief will make a rare public appearance at a local conference while the companys down under wing confirms it hasnt yet managed to create a software fix for problems with the iPhone 4′s proximity sensor.
Apple had previously promised to patch the proximity problem, which affects some iPhone 4′s. What happens is that when a caller holds the phone to their ear, the sensor can get its job wrong and either cuts off the call or leaves the buttons vulnerable to being accidentally pressed by a users ear.
Steve Jobs last month said the sensor problem would be fixed in a future software update, but this hasnt yet appeared.
Apple Australia spokeswoman Fiona Martin acknowledged the company had yet to fix the problem, but builds of iOS 4.1 show promise.
Apple Australias chief exec, Tony King, will appear as part of a ten-member panel of Tasmanian tech firms where there will be talk on innovation and the mobile industry.