Issue with Proximity Sensor during calls

I'm having an issue with the Proximity Sensor not properly detecting when i'm holding my phone to my ear. I can confirm that the iPhone sensor is working by covering it with my finger, but when held to my face, the screen blinks as if it cannot decide to disable the screen or enable it. It results on me hanging up, putting calls on mute, and dialing numbers accidentally while i'm on the phone. This occurs on 90% of my calls. Is anyone else experiencing this issue. I would like to confirm whether this is a software issue (Proximity Sensor sensitivity too low) or a design issue (sensor now placed towards the end of the phone).

Macbook Pro, Mac OS X (10.6.4)

Posted on Jun 23, 2010 8:09 PM

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1,688 replies

Jul 10, 2010 7:25 AM in response to Chris Skitch

I am an avid iPhone enthusiast. My Wife has the EVO4. I have had every generation including the iPhone4 which i have returned including two replacements for the same issue. Its one thing to have issues with applications (Evo4) but it's a totally different concern when you cant even have a two minute phone conversation. The proximity sensor is definitely a major issue of which i am almost certain a software update will not be capable of correcting. In South Florida Sprint reception is superior to that of AT&T. Again I loved all previous iPhones and up until now loved Apple. Lets face it people. Apple blew it this time!!

Jul 10, 2010 7:54 AM in response to Chris Skitch

Chris Skitch wrote:
@Bobby1983, wrong thread. This is the proximity issue thread, not the antenna one.


Actually, he didn't post in the wrong thread. He was just saying that if you read Apple's release about the upcoming software update, it mentions only that it will fix how bars are displayed. It says nothing about the update addressing any other flaws (i.e. the proximity sensor.) So, if you take them at their word, it would seem that the update won't address anything other than how the phone displays bars.

The clock is ticking, Apple. You have five days to fix the proximity sensor so that I can use your iPHONE. If you don't fix the problem by then, I will have no logical choice except to return the phone, cancel my AT&T contract, and go to Verizon.

I just called AT&T to confirm the correct procedure to cancel my service and the lady apologized at least seven times in a seven minute phone call even though I repeatedly told her I would be leaving AT&T solely because of Apple. I hope AT&T is keeping a record of all the accounts that have been or are being closed due to iPhone 4 flaws. Perhaps they could bring that up with Steve and the gang at their next meeting.

Jul 10, 2010 7:59 AM in response to mquack

I also downgraded back to my 3GS. I do not have any of the proximity problems or face dialing anymore either. However, that does not necessarily mean that the issue is not in the software. The iOS4 would most likely automatically detect what hardware you are running and make adjustments and activate features, etc based on the hardware.

For example, the iPhone 4 only has one proximity sensor where the other phones may have more than one sensor, different sensor equipment, etc.

Also, no, I do not work for Apple. Just going off of experiences with their regular OS X software as it relates to different models of Mac hardware, laptops, etc.

Different packages can be installed or activated during the software installation and sometimes settings are adjusted differently based on the hardware you are installing on. (i.e. quad processor vs dual or single, Mac Pro vs Macbook)

mquack wrote:
I have a 3Gs and I'm currently running iOS4 and have not experienced any of the disconnect, etc. issues being described here so I'm guessing it's not the software - at least as it runs on the 3Gs. I have an iPhone 4 in my cart but it's gonna sit there till this issue is fixed. Good luck.

Jul 10, 2010 8:23 AM in response to dlflyboy

I have a few friends that have the 4 that don't have problems but they also tell me that they never let the phone touch their face. My other friend has a bluetooth headset and of course, has no problems, so I think it is also affecting those of us that use just the phone like we always did and have it either in close range or let it touch our faces...

Not that my other friends changed how they use their phones now or anything. They just always used it like that even with the 3G and 3GS.

Just my opinion on why it is not affecting everybody. Not an excuse or to say we should adjust how we use the phone. We should not. Just shedding some light on the subject so we don't all just think we are crazy or something.



dlflyboy wrote:
I've had my IP4 since launch day. The only time I've had an issue with the proximity sensor is when I try to hold the phone with my shoulder (which is understandable). Other than that it stays off when up to my ear.


Message was edited by: iPhoneFanSince2G

Message was edited by: iPhoneFanSince2G

Jul 10, 2010 9:04 AM in response to lavrishevo

Is is possible that you could check your serial number for when your phone was manufactured and where. Trying to narrow down if maybe there was just a bad batch made on a particular assembly line or factory. I have confirmed that my original and my replacement unit were manufactured at the same factory only about 1500 units apart. If you do not know how to do it just Google it will come up. I do not want to post the link here. Not sure if it is ok with Apple to do so don't want my post to be deleted.


lavrishevo wrote:
@Vatkins1906

Logic would only denote that if I have yet to have the problem
I doubt it will develope. I do not press the phone against my face either but when it is in contact with my ear the screen turns off. Not one instance in 18 days of ownership.

Jul 10, 2010 9:38 AM in response to mdalegre

I am starting to wonder if this has something to do with the phone getting warm from being pressed against an ear. I have noticed when I first make a call after not using the phone for a while it works fine. When I am on a really long call or making a string of calls that warms up the phone where it touches my ear, the sensor starts to get glitchy and suddenly, I'm making multiple calls and, muting calls, putting folks on hold etc. Are other people having similar experience?
I really don't see how this can be a software issue since the same OS is working just find on 3GS and some people aren't having problems unless those later folks are only making short calls.

Jul 10, 2010 9:46 AM in response to mdalegre

I just noticed the same issue, I accidentally muted my call, So i tried to lock the screen and it hung up, I have also noticed on one call where I had the number pad open cause it was an automated line, I put the phone to my ear and it started dialing numbers.

Luckily I do not seem to be having any reception problems whatsoever. I can hold my phone any way I want so far!

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Issue with Proximity Sensor during calls

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