Proximity sensor woes caused by reflective ear canal

On Fridays I work from home and sometimes lead conference calls using my personal cell phone. This past Friday I was leading a call via my shiny, new iPhone 4 when suddenly, out of the corner of my right eye, I noticed the screen illuminate. Immediately thereafter the phone call was disconnected (via cheek touch,
Following the requisite support path to Genius Bar satisfaction, I restored my iPhone and again that evening experienced the very same cheeking phenomenon.
Knowing others were having issues with their proximity sensor, I made an appointment at my local Apple Store with one of the esteemed "Geniuses." His name will remain redacted but I swear he stifled a laugh when he told me the cause of the problem. Apparently, the re-location of the proximity sensor in iPhone 4 causes the sensor to be more likely to be triggered by light "bouncing around the ear canal."
I blankly stared at him hoping that he was joking only to find out he was not. My appointed Genius explained that I should try closing the windows because extra ambient light bouncing around my ear will cause the sensor to light up the screen. He said that's all there was to it and sent me on my way.
I find myself incredulous that such an explanation could even be plausible let alone acceptable as IT fodder. I have worked in a similar situation and can understand the occasional straw-grasping that can occur when a solid explanation can't be found.
Honestly, I would have preferred the Genius to tell me he didn't know what the cause was and ask me to come back if it happened again. Mind you, this is the same "Genius" who told me that the melting point of aluminum was
For now, I will sit on the issue in hopes that it does not occur again. However, the next time cheeking leads to call dropping, I'm going back to the Apple Store and requesting a smarter Genius.
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Source: http://tuaw.com/tag/geniusbar
Following the recent release of iPhone 4 several of you reported an issue with the proximity sensor running amok during your calls. Our...
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Mac "geniuses" are anything but.
July 19 2010 at 11:13 AM Report abuse Permalink rate up rate down ReplyI never experienced anything on my 3gs -- nor did we ever HEAR about this problem from others -- so I would be comfortable questioning the Genius' explanation as it would apply to previous generations as well. Doesn't that make perfect, logical sense??
While I was at work inside a temperature-controlled building with my naked 4G (no cover, nothing), I was on a call when all of a sudden I stopped hearing any replies -- and then suddenly heard RINGING (through the speaker, as if I had made another call). Not knowing what the heck happened, I moved the phone away and looked at the screen -- and was completely dumbfounded to see that I had, without hands, put my original call on hold and somehow dialed an old neighbor!!
That's the only time I've had a problem, but it certainly shook my confidence in the phone a little!
My iPhone 4 had "morning wood" this morning when I took it out of it's charging dock. Has anyone else experienced this?
July 07 2010 at 8:06 AM Report abuse Permalink rate up rate down ReplyI am glad that this story broke. Because you see...I too have suffer from cheeking.
I suppose that I shouldn't talk when I'm on the phone. It seems my cheeks press random buttons (audible tones) and then disconnect me.
Ahh...the benefits of being early adopting.....
Guys (n gals)!
Just got an email from Steve Jobs about this issue.
Acctually it is not an issue with the phone. Those who experience the problem is holding the phone in a non Apple approved way.
Sorry, you need to change your phone habits and adjust to the real way of using iPhones!
Have a picture of how to hold it but must have missplaced it... It was something about holding it with two righthand fingers against your forehead... well you all get the picture :)
Considering my experience with industrial IR sensors I think I know what the Apple rep was trying to say. It isn't the an issue of mirrors but rather the lack of a surface normal to the IR sensor to reflect the light strongly. As the good doctor described earlier there isn't a straight shot to a reflective surface, in fact it is just the opposite as the canal would tend to attenuate reflections significantly.
As to iOS I have to agree with many others here, there are significant issues, bugs, in iOS 4. The performance is really poor on my 3G but I'm not convinced it is totally a hardware issue. There is enough strangeness for me to think the software has a lot if bugs.
This is one of the reasons I don't discount Apples coming software fixes. My 3G has networking issues I've never seen before 4.0. I can't blameAT&T here as the issues started to show up right after installing 4.0. So I'm not going to blame the 4G iPhone hardware for all the issues that float about the net. To put it plainly Apple hasn't tried hard enough with iOS 4.
The mess that is iOS 4.0 has me thinking that it might be awhile before Apple roles out the next software rev. There are to many intertwined issues for one little fix to solve.
...have you tried SettingsGeneralResetReset All Settings?
My 3 was crashing and stalling every 5 pages in Safari. "Open in a new page" would go dead for 30 seconds and then crash.
I tried Reset All Settings and iOS4/Safari is a lot more stable and responsive.
The only major setting I had to reenter was my wifi password ...which is probably where the fault was.
This happens to me a little too often. I need to stop making excuses for this phone and bring it back.
July 06 2010 at 11:15 PM Report abuse Permalink rate up rate down ReplyI'm sorry. I am a very, very loyal mac customer. And an apple stock holder. And the proximity sensor problem is real and AWFUL. I hang up on calls all the time. I did not have this problem with either my original 2g phone or the 3gs.
THIS THING NEEDS TO GET FIXED OR IT WILL ACTUALLY BRICK THE PHONE FOR ME ... meaning: returning if I can get Apple to take it back and moving on to some other phone.
I mean ... the darn thing has a front facing camera. They should use that to IMPROVE the proximity sensor. How can it be WORSE with this new phone?!?!?
July 06 2010 at 9:28 PM Report abuse Permalink rate up rate down ReplyHow does any of this explain how my 3GS started doing this when I upgraded to IOS 4.0?
I suspect that Apple will need to use AT&T's more accurate formula for calculating the distance from your head.
I believe the issue is tempature related. Today my phone went dark (dimmed). And would not return to normal britness until I could cool the phone down. Which I did after getting tempature warning soon after.
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