Database Users

problem while talking on the phone

Does anyone have an issue with your cheek pushing buttons while you are on the phone? I am running liberated_aria and whenever i am on the phone, my screen does not shut off like other phones and I end up either hanging up on people or moving widgets and even adding widgets..
has anyone else noticed this? is there a fix for it?

Its happened to me once on an Aosp rom. Haven't had any problems after that though.
Sent from my HTC Liberty using XDA App

I haven't had any problems. The proximity sensor is on the top right of the phone, where the AT&T logo is. Try making a call, to voicemail or something, and then waving your finger over the sensor. Does it ever turn the display off? Could be a software bug I suppose, or just a faulty sensor.

if you use your left hand/ear its pretty easy to dodge the sensor, unfortunately.

I tried a call using my right hand and I dont have that problem. Only the left.. I guess Ill have to start making all my calls right handed.

It figures...
Us southpaws always get the short end of the stick. FWIW, I almost always hold my phone(s) left handed, and only rarely seem to have this problem. ( It might just be that I have a huge head, and big ears. )

Im a righty and sometimes when making calls i get a haptic vibration from my face touching the nav buttons i think, nothing happens though.

My girlfreind is having the same issues with her handset.
We found her an Aria about 2 weeks ago at Best Buy Mobile for $1. They are running some great special for non-iphone handsets. The Aria was giving her problems and we ended up exchanging it. The 2nd Aria also has the same issue. While on the phone, her cheek will press random buttons and even hang up. Sometimes she just feels vibration, sometimes its a number pad press, and sometimes she just hangs up all of a sudden.
It seems to be some sort of sensor issue. Does anyone have some insight as to how to fix it? It's kinda of a big deal if the phone function is impaired by having to hold it away from your face.
Thanks!

NomeUF said:
My girlfreind is having the same issues with her handset.
We found her an Aria about 2 weeks ago at Best Buy Mobile for $1. They are running some great special for non-iphone handsets. The Aria was giving her problems and we ended up exchanging it. The 2nd Aria also has the same issue. While on the phone, her cheek will press random buttons and even hang up. Sometimes she just feels vibration, sometimes its a number pad press, and sometimes she just hangs up all of a sudden.
It seems to be some sort of sensor issue. Does anyone have some insight as to how to fix it? It's kinda of a big deal if the phone function is impaired by having to hold it away from your face.
Thanks!
Click to expand...
Click to collapse
Other then making sure her head is covering the sensor, she canlock the phone in mid call and it should stop her phone from registering her cheek while on a call
Sent from my Behold II using XDA App

ryan92084 said:
if you use your left hand/ear its pretty easy to dodge the sensor, unfortunately.
Click to expand...
Click to collapse
Huh. I'm a righty, but I talk left hand / left ear, and I never have any problems. Do you tilt the phone in some strange way?
Sent from my HTC Liberty using XDA App

psychoace said:
Other then making sure her head is covering the sensor, she canlock the phone in mid call and it should stop her phone from registering her cheek while on a call
Sent from my Behold II using XDA App
Click to expand...
Click to collapse
Thats a good idea. Thanks.

This issue is really pissing me off. I love this phone a lot but the proximity sensor is not working as it should, atleast with my head shape.
Seems almost in every other call I make/receive my cheek contacts the screen and pushes something because the proximity sensor is not detecting me head.
I've tried locking the phone with the button on top of the phone but that does not work, it's only temporary until the proximity kicks back in.
And, the funny thing is, when I try to "test" it out or replicate the situation I can never seem to do it again! It always happens unexpectedly.

I'm in the same boat with this too, but it's a hit or miss thing and really could be much worse.
Sent from my HTC Liberty using XDA App

i can't say i've ever run into this specific problem. i've actually been impressed with how well the sensor has been working.
i would agree with the previous poster who suggested to lock the screen once the call is active. make your call then tap the power button to lock the screen and that should help you avoid the issue.

mattbollenbach said:
i can't say i've ever run into this specific problem. i've actually been impressed with how well the sensor has been working.
i would agree with the previous poster who suggested to lock the screen once the call is active. make your call then tap the power button to lock the screen and that should help you avoid the issue.
Click to expand...
Click to collapse
This doesn't work unfortunately.
Sent by Aria

Magnetic screen wake realization

I know many people are having issues regarding the cases that wake your device. A supposed fix is to turn on wifi or bluetooth. I just noticed today that if you're using a custom kernel with doubletap2wake or sweep2sleep/sweep2wake, that enabling either the doubletap2wake or sweep2wake fixes the issue as well. The screen auto wakes using my Slimline if that option is enabled. I feel like this is a step towards narrowing down what the issue is.

Actually, I flashed a kernel with those features because of my wake issue and it didn't fix anything at all for me. It was exactly the same, which I expected. It was annoying, though, so now I just leave Bluetooth on and call it a day. I'd rather leave Bluetooth on all the time than have to double tap every other time I open my cover.
Sent from my Nexus 7 using xda app-developers app

RKight said:
Actually, I flashed a kernel with those features because of my wake issue and it didn't fix anything at all for me. It was exactly the same, which I expected. It was annoying, though, so now I just leave Bluetooth on and call it a day. I'd rather leave Bluetooth on all the time than have to double tap every other time I open my cover.
Sent from my Nexus 7 using xda app-developers app
Click to expand...
Click to collapse
I've had doubletap2wake on all day. Airplane mode on. Works every time. The moment I turn off doubletap2wake--the issue pops back up. Maybe I'm just lucky/unlucky?

I always read around the forums that everyone has problems with the magnetic wake lock, but my supcase works perfectly fine each time I open it. I'm even running CM10.2 Kang FLO version. Could it just be the cases people are using?

Highly doubtful. If it was something where the case would intermittently work all the time or it was something that only happened if the case was folded back, then maybe it is the case.
In this case, the case works all the time until there is some wifi event or the unit goes into deep sleep under certain situations.
The case is a simple magnet. It just needs to be strong enough to be recognized consistent. It has no idea about those states.
FWIW Google/Paul mentioned they were able to duplicate the problem and are looking into it.

sfhub said:
FWIW Google/Paul mentioned they were able to duplicate the problem and are looking into it.
Click to expand...
Click to collapse
Oh really!? I hadn't seen that. Looking forward to a future update then.

natezire71 said:
I've had doubletap2wake on all day. Airplane mode on. Works every time. The moment I turn off doubletap2wake--the issue pops back up. Maybe I'm just lucky/unlucky?
Click to expand...
Click to collapse
Rather than using airplane mode, have you tried leaving bluetooth off and WiFi on but setting WiFi to sleep when the screen is off? That's how I can reproduce it consistently.
Sent from my ADR6425LVW using xda app-developers app

RKight said:
Rather than using airplane mode, have you tried leaving bluetooth off and WiFi on but setting WiFi to sleep when the screen is off? That's how I can reproduce it consistently.
Sent from my ADR6425LVW using xda app-developers app
Click to expand...
Click to collapse
Dammit. That did it. Oh well, I was wrong.

How i solved the wake lock/ lock screen hang issue
Guys I solved the issue you will not believe how simple this is lol.
The issue isn't hardware or software for that matter, YES NOTHING IS WRONG WITH YOUR DEVICE, but rather the cases themselves. My issue was that the device would lock whenever i had the case folded back in either Landscape or Portrait mode. Whether watching a movie or reading my books/ comics
I tried toggling Bluetooth and Wi-Fi no success. :crying:
However, I realized that using the Tablet in the case while it was in "standing mode". The screen would never turn off. So I tried something and took a leap of faith.
Instead of having the power button inline with the magnetic strip on your case, i just turned it upside down i.e. swivel the tablet so that the power button was no longer inline with the magnetic strip. I held the edges near the power button as hard as i could and it never once turned off lol. :good:
Yet as soon as i turned it back to be inline with the strip it turned off instantly with every try. After several exhausted tries I am certain that this works and solves the issue. as a matter a fact once you remove the magnetic strip side away from the power button it doesn't hang up, the effect is instantaneous.

NeoSlyfer said:
Guys I solved the issue you will not believe how simple this is lol.
The issue isn't hardware or software for that matter, YES NOTHING IS WRONG WITH YOUR DEVICE, but rather the cases themselves. My issue was that the device would lock whenever i had the case folded back in either Landscape or Portrait mode. Whether watching a movie or reading my books/ comics
Click to expand...
Click to collapse
Glad you fixed your own issue, specific to your (badly designed) case. This thread is about the 2013 Nexus 7 not waking after being asleep for a while, using the magnetic case sensor.

khaytsus said:
Glad you fixed your own issue, specific to your (badly designed) case. This thread is about the 2013 Nexus 7 not waking after being asleep for a while, using the magnetic case sensor.
Click to expand...
Click to collapse
Well then

NeoSlyfer said:
Guys I solved the issue you will not believe how simple this is lol.
The issue isn't hardware or software for that matter, YES NOTHING IS WRONG WITH YOUR DEVICE, but rather the cases themselves. My issue was that the device would lock whenever i had the case folded back in either Landscape or Portrait mode. Whether watching a movie or reading my books/ comics
I tried toggling Bluetooth and Wi-Fi no success. :crying:
However, I realized that using the Tablet in the case while it was in "standing mode". The screen would never turn off. So I tried something and took a leap of faith.
Instead of having the power button inline with the magnetic strip on your case, i just turned it upside down i.e. swivel the tablet so that the power button was no longer inline with the magnetic strip. I held the edges near the power button as hard as i could and it never once turned off lol. :good:
Yet as soon as i turned it back to be inline with the strip it turned off instantly with every try. After several exhausted tries I am certain that this works and solves the issue. as a matter a fact once you remove the magnetic strip side away from the power button it doesn't hang up, the effect is instantaneous.
Click to expand...
Click to collapse
What case are you using? Lol

natezire71 said:
What case are you using? Lol
Click to expand...
Click to collapse
I am not sure what the case is called it's a generic case however I have photos of said case

Screen turns on when I pull it out of my pocket.

What would be causing my screen to be turning on by itself? Did I trip some settings on accident?
Sent from my SM-N900V using Tapatalk

loopers said:
What would be causing my screen to be turning on by itself? Did I trip some settings on accident?
Sent from my SM-N900V using Tapatalk
Click to expand...
Click to collapse
There is a setting for hand gestures or s voice that would do that
Sent from my SM-N900V using Tapatalk

Where?
Sent from my SM-N900V using Tapatalk

Still haven't found
Sent from my SM-N900V using Tapatalk

that's not the issue.... something else causing it.. hand gestures turned off

Are you using it naked? As much as I hate cases, I ended up putting Poetic something bumper case on my Note 3 to prevent power, volume and home buttons getting turned on all the time while my phone is in my pocket.

its not just doing it in my pocket... i used the pocket as an example..... here is what is happening....... turn the phone over (the sensor is looking at a dark area).. screen goes black after a few seconds..... now flip phone back over in a lighted room.... unlock screen appears with no touches of the button...(tried this 50 times now at least)... if i cover the sensors at the top with my hand.. then uncover them... lockscreen comes on.. (not the notifications screen, that is entirely different)..... all motion gestures are turned off..... i've tried all the obvious stuff (unless i'm missing a "phone in pocket" option or something.. tried to find one... didn't come across any.. all though i may have missed a few spots in settings.. this is driving me nuts though... tried it with case/ without case... all the same..

Nobody?
Sent from my SM-N900V using Tapatalk

Doesn't sound like the problem you're having, but my home button got pressed in my pocket all the time. So I used an Xposed module (Wanam, I think) to make the home button not turn the screen on anymore.

well not sure why.. but i did a soft reset... everything was already on my card. just had to redownload stuff.... wasn't too far in so no real biggy.... soft reset fixed the issue...... i messed with it for 4 hours last night trying everything.. nothing worked.. soft reset worked.... why? who knows..... same apps are back on...... makes me a little uneasy honestly

S5 screen TOO sensitive?!?!

Right I have now had this issue several times and it has become a big problem. I put the phone in my pocket, get a call/message/text/ which turns the screen on, and somehow the touch screen buttons keep getting pressed. So far I have lost all my paid for credits in a game when I paused it and put it in my pocket to get off a train, had it start skipping tracks when listening to music when a message arrived and it started pressing the lockscreen music buttons while in my pocket....twice.
I never EVER had anything like this with the S3 that it replaced. Somehow the screen is obviously being pressed by my leg THROUGH my trousers and activating the buttons on the touchscreen whenever the screen is on. Obviously this may have serious consequences if it starts calling contacts or even emergency numbers while in my pocket.
I am looking for a way to reduce the sensitivity so it doesnt do this but so far all I can find in the settings is a single tickbox to INCREASE the sensitivity so you can use it with gloves on (which suggests to me it must also be possible to reduce it).

Yup
Sent from GT-I9500

ewokuk said:
Right I have now had this issue several times and it has become a big problem. I put the phone in my pocket, get a call/message/text/ which turns the screen on, and somehow the touch screen buttons keep getting pressed. So far I have lost all my paid for credits in a game when I paused it and put it in my pocket to get off a train, had it start skipping tracks when listening to music when a message arrived and it started pressing the lockscreen music buttons while in my pocket....twice.
I never EVER had anything like this with the S3 that it replaced. Somehow the screen is obviously being pressed by my leg THROUGH my trousers and activating the buttons on the touchscreen whenever the screen is on. Obviously this may have serious consequences if it starts calling contacts or even emergency numbers while in my pocket.
I am looking for a way to reduce the sensitivity so it doesnt do this but so far all I can find in the settings is a single tickbox to INCREASE the sensitivity so you can use it with gloves on (which suggests to me it must also be possible to reduce it).
Click to expand...
Click to collapse
You may have a faulty handset as I don't have these problems on mine.
Sent from my SM-G900F using Tapatalk

I doubt it. Friend has one as well, does exactly the same, rub phone on chest to clean it and it is pressing buttons/icons etc on the touchscreen if the screen is on.

Did you turn out that thing in settings that makes the screen more sensitive so that you can use it with gloves on?

There's the air wakeup setting too
Sent from my SM-G900I using Tapatalk

I've owned the S2, S3, S4 and never had this problem. Now I have a G900F. The S5 screen is ridiculously sensitive and I have the exact same problem as the OP.

Try to add a pattern lock screen, it should prevent the phone from launching anything even if the screen wakes up.

Yeah I've been having the same problems I switched the touch sensitivity toggle off and it's been ok
Sent from my SM-G900F using xda app-developers app

kthz said:
Try to add a pattern lock screen, it should prevent the phone from launching anything even if the screen wakes up.
Click to expand...
Click to collapse
It' on pattern lock. That doesnt stop notifications coming up for anyone that has it set up like that, and it doesnt stop it pressing the emergency calls button!
Air View is off, Increase Touch Sensitivity is off (as already mentioned). Infact I tried the Increase Touch Sensitivity option to see what effect it has and I can't see any difference to it with it turned on, it is just as sensitive, I can literally put my finger inside my shirt and move the screen around and I can do this just as well with the touch sensitivity on or off. Perhaps there is a bug which is causing the increased touch sensitivity to be on ALL the time even when the box is not ticked. Seems to be a problem many are having anyway.

ewokuk said:
It' on pattern lock. That doesnt stop notifications coming up for anyone that has it set up like that, and it doesnt stop it pressing the emergency calls button!
Air View is off, Increase Touch Sensitivity is off (as already mentioned). Infact I tried the Increase Touch Sensitivity option to see what effect it has and I can't see any difference to it with it turned on, it is just as sensitive, I can literally put my finger inside my shirt and move the screen around and I can do this just as well with the touch sensitivity on or off. Perhaps there is a bug which is causing the increased touch sensitivity to be on ALL the time even when the box is not ticked. Seems to be a problem many are having anyway.
Click to expand...
Click to collapse
Not had any problems whilst in my pocket, but I tried using the screen through my T-SHIRT and it does the same thing for me with touch sensitivity off or on. Just tried with gloves though and it doesn't work unless you switch touch sensitivity on, so it does make some kind of difference to the screen.
Sent from my SM-G900F using Tapatalk

In that case ewokuk, 2 solutions, since your phone is brand new, maybe you should take it back to your store and get another unit.
Or wait for maybe a fix with next firmware update.. which may happen anytime. For helping you, you could get a protection / front cover for your phone

I registered just to post here. This has been driving me absolutely nuts. Every time I have a call when in the car and the phone is in my pocket (talking through bluetooth), if my leg so much as twitches I end up muting myself or hanging up. I went from an S3 to the S5. If I get a text while walking and I have music playing or something, any and every button available will be pressed. I have had random gibberish created on my calendar while walking (screen lock hadn't activated yet because I had just put it in my pocket).
ewokuk, any word on what you did? I have played around with as many settings as I can but nothing seems to do the trick. It's a nice phone, but unfortunately this one thing drives me up a wall

The screens can still be used through simple fabrics .. it can be done so since the S2. If the screen is in the pocket facing down (against your thigh) it still can be triggered. I can only suggest to put the screen facing outwards or well not against your skin or body
Sent from my GT-I9505 using XDA Free mobile app

deathst said:
The screens can still be used through simple fabrics .. it can be done so since the S2. If the screen is in the pocket facing down (against your thigh) it still can be triggered. I can only suggest to put the screen facing outwards or well not against your skin or body
Sent from my GT-I9505 using XDA Free mobile app
Click to expand...
Click to collapse
The difference in sensitivity between the S3 and S5 is pretty astounding though. Yes, I could use the S3 through a shirt if needed, but I never had it hang up phone calls constantly and go through all my apps randomly.
I think the proximity sensor is just not the greatest as it doesn't detect that it's in a pocket. Again, no real idea, but that is my guess.

Same problems here. Phone pocket dials people, replies to texts. Pattern lock helped..but I prefer not using it. Maybe it's because the phone wakes with text messages received. Annoying as heck
Sent from my SM-G900V using XDA Premium 4 mobile app

Rippley05 said:
Same problems here. Phone pocket dials people, replies to texts. Pattern lock helped..but I prefer not using it. Maybe it's because the phone wakes with text messages received. Annoying as heck
Sent from my SM-G900V using XDA Premium 4 mobile app
Click to expand...
Click to collapse
I'm glad I'm not the only one because I really did think it was just me. All of the issues listed in this thread happen to me all the time. Tracks skip, the phone hangs up.. I even find my typing is less accurate unless I really slow myself down (it seems prone to picking up extra key presses although this might just be mel. I did not have these issues with my s3.
---------- Post added at 12:36 AM ---------- Previous post was at 12:32 AM ----------
Forum wouldn't let me edit my previous message so here goes:
No its just me. See here http://phandroid.com/2014/04/19/8-things-i-hate-about-the-samsung-galaxy-s5/:

Hey all, i am facing the same problem with the sensitivity of my screen!
ewokuk said:
Right I have now had this issue several times and it has become a big problem. I put the phone in my pocket, get a call/message/text/ which turns the screen on, and somehow the touch screen buttons keep getting pressed. So far I have lost all my paid for credits in a game when I paused it and put it in my pocket to get off a train, had it start skipping tracks when listening to music when a message arrived and it started pressing the lockscreen music buttons while in my pocket....twice.
I never EVER had anything like this with the S3 that it replaced. Somehow the screen is obviously being pressed by my leg THROUGH my trousers and activating the buttons on the touchscreen whenever the screen is on. Obviously this may have serious consequences if it starts calling contacts or even emergency numbers while in my pocket.
I am looking for a way to reduce the sensitivity so it doesnt do this but so far all I can find in the settings is a single tickbox to INCREASE the sensitivity so you can use it with gloves on (which suggests to me it must also be possible to reduce it).
Click to expand...
Click to collapse
i am ahvind the same issue with the sensitivity of the screen!!!something wrong is happening for sure cause i tested another Samsung S5 and it didnt have any problem!Its has warranty so i dont care!do the same!
---------- Post added at 10:23 PM ---------- Previous post was at 10:15 PM ----------
ewokuk said:
Right I have now had this issue several times and it has become a big problem. I put the phone in my pocket, get a call/message/text/ which turns the screen on, and somehow the touch screen buttons keep getting pressed. So far I have lost all my paid for credits in a game when I paused it and put it in my pocket to get off a train, had it start skipping tracks when listening to music when a message arrived and it started pressing the lockscreen music buttons while in my pocket....twice.
I never EVER had anything like this with the S3 that it replaced. Somehow the screen is obviously being pressed by my leg THROUGH my trousers and activating the buttons on the touchscreen whenever the screen is on. Obviously this may have serious consequences if it starts calling contacts or even emergency numbers while in my pocket.
I am looking for a way to reduce the sensitivity so it doesnt do this but so far all I can find in the settings is a single tickbox to INCREASE the sensitivity so you can use it with gloves on (which suggests to me it must also be possible to reduce it).
Click to expand...
Click to collapse
i am having the same issue about the sensitivity of the screen!!!something wrong is happening for sure cause i tested another Samsung S5 and it didnt have any problem!Its has warranty so i dont care!do the same!

s series sensitivity
I have had that problem with the s3 s4 and now s5 i just put my phone in my pocket with the screen facing out that way my leg cant activate it and my pants doesnt press the unlock button when i move.

Ditto, never so bad as this phone, I put it in my pocket now screen out, and put my wallet over the screen so I don't accidentally crack it.
Often in games when I am "hovering" over the screen it will trigger the action anyway. I've tested this to nearly 1 full cm away from the screen. If I hover on the same spot for 2+ seconds at ~1cm it initiates a touch at that point.
I also did not notice a difference switching increased sensitivity on or off.
Rarely, but sometimes during calls the screen turns on briefly when I pull the phone away as it starts making my face sweat, it will the "hover" hang up or mute, or launch some app (often one that has force screen on permissions) and send people gibberish email or text messages, set alarms or calendar events. I even had it start a conference call, adding an old boss to my conversation (I keep the number handy for references) once.
I have used the finger print lock since the first time I turned the phone on. Most annoying is the sensorly app, only works with the screen on even when running in the background...
I have also had to modify my typing to accommodate this sensitivity, I have to tap slightly above and right of the keys to make sure I hit the right ones.

My ear messing with calls

I keep disconnecting or putting people on mute whatever with my ear, is there a setting to turn the screen off during calls?
Sent from my SM-G975F using Tapatalk

Is this in the native dialer?

Your phone screen should automatically turn off when you put your phone to your ear.

Corv0 said:
Is this in the native dialer?
Click to expand...
Click to collapse
Yes, screen doesn't turn off
Sent from my SM-G975F using Tapatalk

Davey Dual Sim said:
Yes, screen doesn't turn off
Sent from my SM-G975F using Tapatalk
Click to expand...
Click to collapse
That's odd and wrong, the proximity sensor is about 0.5 cm left to the camera cutout, make sure you don't:
Have a dirty display
Use an invasive case
Use a badly applied screen protector, some glass ones can cause problems too
Cover only the left side of the screen with your ear
What software are you on?

S10+ out of the box with the Samsung screen protector , the Spiggen air case, the thinnest one on the market and stock Pie, using Nova
Sent from my SM-G975F using Tapatalk

I've had the same thing happen a couple of times. The prox sensor is too far to the edge of the phone so it doesn't always "see" my face when I hold it up to my ear. I had the same issue with LG G7.

It's happen to me as well but I don't really mind since I text more often than I do calling people ?

Davey Dual Sim said:
S10+ out of the box with the Samsung screen protector , the Spiggen air case, the thinnest one on the market and stock Pie, using Nova
Sent from my SM-G975F using Tapatalk
Click to expand...
Click to collapse
Can you replicate the bug by playing a WhatsApp audio file(can be your own) and covering the top of your phone?

It's easy to replicate on a call. Hold the phone up to your left ear and just slightly rotate it away from your head. You'll see the screen come on. It all depends on how you hold phone while you're talking.

Corv0 said:
Can you replicate the bug by playing a WhatsApp audio file(can be your own) and covering the top of your phone?
Click to expand...
Click to collapse
Yes, I've tested the proximity sensor and it works, so it's more about how I hold the phone it seems. I take a lot of calls whilst on the move and i pace about a lot whilst talking.
It seems the screen is going on and off and my ear is touching the screen before the sensor turns it off again.
For someone who makes 30 or 40 or so calls a day the problem is me and the fact I'm never sitting at a desk when doing so.
I need to work around this with an ear use routine lol
Sent from my SM-G975F using Tapatalk

proximitysensor
Davey Dual Sim said:
I keep disconnecting or putting people on mute whatever with my ear, is there a setting to turn the screen off during calls?
Sent from my SM-G975F using Tapatalk
Click to expand...
Click to collapse
very old thread, but i suffer the same issue, even with all the updates. only when under lineageOS the proximity-sensor works just fine. bur lineage is no solution, unfortunately.
Did you ever manage to really solve this ?
best regards from switzerland

The issue of the Prox sensor is one as old as smartphones. My questions and advice usually go like this,
Do you have long hair that drapes over your ear? Hair that hangs in front of your ear is not always solid enough to be detected. Light can also bleed through and cause false signals allowing the screen to stay on. There are two ways to overcome this, press the phone tightly to your ear. This compacts the hair and blocks the light. Some don't like this because of the pressure. Pull your hair back before placing the phone to your ear.
Are you sure of the device placement? Everyone's ears are different and sometimes the sensor can miss the ear. Slight adjustments forward or back can land the sensor on a solid portion of the ear rather than a recessed area. Also holding the phone too high can be an issue as your ear is actually under the sensor. Figuring out ear placement becomes muscle memory and can change from device to device you just have to find the spot first then make an effort to hit a few times until it's natural.
Is your screen clean? Ironically a dirty screen can cause issues with these sensors as well. If the screen is dirty from makeup or natural oils in the skin the sensor may have a difficult time realizing there's a difference and not react. Just running your palm over the upper portion of the screen right before placing the device to your ear should be enough to clean the sensor and provide a contrast reference.
Most of you have tested your sensor but for those who haven't if you continue to have issues it is always possible that there is a defect in the sensor. If none of the above advice has worked it's a good idea to test both the Prox and light sensor. To test the light sensor, set your device to auto brightness and in a well lit area place your palm over the upper portion of the phone, the screen should dim. To test the prox sensor, place a call or have a friend call you and place your palm over the upper portion of the screen, the screen should go dark with no display.
If all of the advice fails and the phone also fails the sensor tests you may need to take the device in for service.
A temporary solution would also be to not hold the phone flush against your cheek while on calls. There are no controls at the top of the phone and muting or disconnecting comes from cheek contact. The mic on the device is very good. You'd actually find that you could sit the phone on the table and talk to someone in a normal voice and they would hear you just fine. You obviously wouldn't hear them as well if not on speakerphone, because speakerphone both boosts the volume and incorporates the second speaker. So even if you held the device a few inches or CM from your mouth the other person would still hear you just fine. This is another technic that requires a bit of practice but can become second nature with the added benefit of keeping your screen a little more smudge free.