yashsingh1/xdaforums huggingface dataset:
[Galaxy S 4 Q&A, Help & Troubleshooting] jlevy73:
As a final update on my end, I took my device to the Samsung Service Center in Beijing. After two weeks with my device they concluded nothing was wrong meaning they found everything with the hardware to be working properly. The person I spoke made a similar suggestion to the OP that I switch to 2G mode when I needed to make a call. That's not a suggestion IMO, especially when I have other devices that work fine when my S4 drops out.
[Galaxy S 4 Q&A, Help & Troubleshooting] arindam_mitra1985:
Thats it !! Samsung fooled us..

Btw does cm10.2 or any other custom rom fix this issue as well as the heating problem?anyone any idea?
[Galaxy S 4 Q&A, Help & Troubleshooting] arindam_mitra1985:
Is this fixed in the official 4.3 version?
[Galaxy S 4 Q&A, Help & Troubleshooting] murphy99:
It seems that the XXUEMJ5 solves the problem ?

See ths post :

http://xdaforums.com/showthread.php?t=2253528&page=1323
[Galaxy S 4 Q&A, Help & Troubleshooting] arindam_mitra1985:
And what with DDUEMJ5? In India we have this update.. any idea..!!
[Galaxy S 4 Q&A, Help & Troubleshooting] Tvercetti28:
I have had the same problem with my S3 and tried all sort of software, modems, factory resets etc and never got this issue fixed untill i have sent it to warranty and they replaced my antenna and microphone, now the problem is fixed so it was an hardware problem afterall.
[Galaxy S 4 Q&A, Help & Troubleshooting] planetf1:
I had plenty of call and data drops in areas of full hspa signal. I tried different roms, reporting to network (Vodafone UK), switching modems, but it didn't go away

I switched networks to three UK and the experience is different. No call or data drops in signal areas.....

I don't think it was the phone, rather an overloaded underprovisioned overpriced network
[Galaxy S 4 Q&A, Help & Troubleshooting] murphy99:
It's not a problem of network.

I have a Galaxy S2 and it works perfectly.

I have "no signal" or "emergency calls only" only with my Galaxy S4.
[Galaxy S 4 Q&A, Help & Troubleshooting] danum:
It's just dawned on me that I haven't had any dropouts since I swapped my battery.

Probably a coincidence?
[Galaxy S 4 Q&A, Help & Troubleshooting] nauniux:
Same experience

I'm having the same issue. Full signal/bars and all of a sudden no signal, circle with a bar across. The signal comes back after some seconds. Most of the time it happened after a couple of days used in WCDMA only mode. It works OK after a restart of the phone. It drops the calls that I do when in that unstable state after the call is established for some seconds. When it's on that state I've changed to WCDMA/GSM and still happens.
[Galaxy S 4 Q&A, Help & Troubleshooting] cmd512:
Yep, none of the 4.2.2 releases has fixed this issue. I have heard that some folks who had this fixed the problem when they went to AOKP ROMs, so I'm hoping that the newer 4.3 releases will improve it...

... I doubt it though.
[Galaxy S 4 Q&A, Help & Troubleshooting] gogodance:
Solution that worked 4 me

Hi there, this is my first post to xda, so I really hope it solves the problem 4 any of U.

I had similar problems with my S4Active to what has been described previously in this thread. The mobile connection (was it either GSM, UMTS or LTE) would drop every 12 minutes, which was to be traced in the settings/more/battery/history details (tap on the battery level graph) as red stripes on mobile network signal axis. Since it had been happening at equal time intervals, I had guessed it had nothing to do with network coverage.

What eventually worked for me was to properly set up the APN settings settings/connections/more networks/mobile networks/access point names as provided by my carrier (Plus GSM, Poland). These were not properly set up even after data+cache wipe reboot, as they were already out-of-date on my SIM card. I had to check for current settings on my carrier's website. I.e. I corrected the APN, authentication type and bearer settings as provided by the carrier. Since then my SGS4A's been working like charm, I had no connection issues whatsoever. :victory:
[Galaxy S 4 Q&A, Help & Troubleshooting] murphy99:
Did you try then versin DDUEMJ5 ?

Did it solve the problem ?

Thanks
[Galaxy S 4 Q&A, Help & Troubleshooting] haksancan:
solved my issue

hi,

I was also experiencing ramdon call drops on my I9500, but now I've solved my issue.

OP is right in that the problem is related to the switch between 2G and 3G networks while the call is continuing. So his workaround is an effective way to avoid the situation.

But you should also know why the connection drops while the switching is happening.

What caused the drops in my situation was that 3G was not enabled in my account on the operators side. My phone was set to select 2G or 3G networks automatically, and when the phone decides 3G is a better choice, it tries to switch to it, but it fails since the operator doesn't allow switching to 3G. And the call drops, normally.

[size=+1] I contacted my operator and enabled 3G in my account, now the drops are gone.[/size] Solved.

Other possible reasons for problematic 3G switches may be related to the sim card itself. Get a new sim if your sim card is old or it is self cutted (not originally microsim).

So I would say [highlight][size=+2]hardware or modem firmware is not the problem, it's related to operator and settings. so check your configuration on the operator side[/size][/highlight]
[Galaxy S 4 Q&A, Help & Troubleshooting] heara:
you are right, i tested all kind of modems and finally bought a zboost amplifier because the signal weakness, and problem solved..is related to network
[Galaxy S 4 Q&A, Help & Troubleshooting] planetf1:
Interesting that my properties like this disappeared when obv moved from Vodafone UK (which had 2g and 3g) where i got it constantly to three UK (which is pretty much 3g only) where obv have never seen the issue. I too had the whole circle, no signal, recycling behaviour
[Galaxy S 4 Q&A, Help & Troubleshooting] murphy99:
The last version MH7 does not solve this issue. Very disappointed...

Sent from my GT-I9505 using Forum Fiend v1.0.6.
[Galaxy S 4 Q&A, Help & Troubleshooting] Obagleyfreer:
Does anyone get a message appearing on the screen saying no network or sim detected and a restart button? I randomly have this appear and have to restart my phone, so annoying!
[Galaxy S 4 Q&A, Help & Troubleshooting] burnsi333:
disable fast dormacy toggle

hi there,

it seems like disabling the fast dormacy toogle will work. I had call drops an signal problems over and over. Now i have disabled the fast dormacy toggle it works fine for me til now.

Maybe its a solution, maybe not.
[Galaxy S 4 Q&A, Help & Troubleshooting] murphy99:
How do you disable the fast formancy ?
[Galaxy S 4 Q&A, Help & Troubleshooting] burnsi333:
Hallo, there is an app in the playstore called fast dormacy toggle. Ist for the Galaxy s3 but works fine with my s4.
[Galaxy S 4 Q&A, Help & Troubleshooting] murphy99:
Ok, I'd like to try but it needs to be root.
[Galaxy S 4 Q&A, Help & Troubleshooting] _alex74_:
Finally some wise words!!

i've solved deleting all existing APN, and then reload it from SIM card, everything fine:good:
[Galaxy S 4 Q&A, Help & Troubleshooting] arindam_mitra1985:
I contacted my operator..they said the same thing!! 3g or 2.5g follow different protocols n different bandwidth. .hence while switching to the best network..operator fails !! If you have best 3g all throughout use autoconnect else stick to either wcdma or gsm.. Feeling happy that hardware is ok atleast!!
[Galaxy S 4 Q&A, Help & Troubleshooting] cmd512:
Several users (including me) have seen this behavior on many different carriers (3 for me in 3 different countries). So, highly unlikely it's operator related for all cases.

And, I'm using a brand new AT&T properly provisioned microSIM, still reconnects. I'm glad APN / new SIMs are fixing the issue for some of you, but this does not address the reconnect issue for many other people.
[Galaxy S 4 Q&A, Help & Troubleshooting] eSSeMM:
On EE in UK ...

I dumped my Nexus 4 because I was regularly getting the signal dropping .

Bought an S4 and it is exactly the same. Seems to be when I move around it drops the signal when I move between coverage areas. If I activate and then de-activate flight mode it will usually recover a signal.

I have noticed that sometimes it says I have no signal yet I can still send and receive data.
[Galaxy S 4 Q&A, Help & Troubleshooting] _alex74_:
it is not operator related, only Android 4.3 and above bug, in fact there's people moaning when 4.3 released.

Do not think that it is bootloader related, in fact i start having this bug with Omega 13.2, then for my fault nearly bricked my S4, after flashing XXUMJ7 end wiping everything i can, same problems....

So i trying to change APN looking troghout the italian forums(APN has a lot of options, in fact maine for S4 has only few to be filled exactly)

After above, better behaviour so i decided to remove completely all APN from operator profiles, and reload it again defaults by SIM card.

It works now perfectly, no data drops.

same behaviour before doing as above..

My conclusions, correct if i'm wrong(never looked what is in CSC) that CSC originally present in 4.3 will provide wrong settings for your operator,

so in this case contact your operator for correct APN for S4
[Galaxy S 4 Q&A, Help & Troubleshooting] cmd512:
Wrong, plenty of us have had this issue with 4.2.2 since the first day the device left its Samsung box AND on multiple carriers. It simply hasn't improved regardless of what you do (clear out APNs, new microSIM, etc etc).

4.3 actually seems to have improved it some, but I'll need to test more to be sure.
[Galaxy S 4 Q&A, Help & Troubleshooting] vacillating:
Although I may agree on the clarification that you may have made in regard to dropping calls because of 2g/3g switch, why it is not happening with other handsets and only Samsung ones, specially S4s? So, I guess it may still be a hardware related issue.
[Galaxy S 4 Q&A, Help & Troubleshooting] oracle01642:
I am having tons of dropped calls on my I9505 with the latest 4.3 BTU firmware. I hope this problem is resolved soon because it is VERY annoying!
[Galaxy S 4 Q&A, Help & Troubleshooting] Granett:
Hi. New to the forum. I've been looking for info on this problem.

I suspect the problem might be affecting more people than is immediately apparent because the symptoms are so hard to diagnose and describe.

I am having problems with my S4 on the Three network here in the UK.

I have taken my handset to a Three store and they have tried my simin another phoen which works fine and another sim in this handset and the problem manifests itself.

For approx 4 days now, sometimes when I switch the phone on, I get a few minutes of network connection, but the rest of the time I get no network at all (circle with a bar in the notifications area, and unable to make or receive calls, messages or use internet).

I am wondering if it has anything to do with the imminent rolling out of the 4g network.
[Galaxy S 4 Q&A, Help & Troubleshooting] kiran.savadatti:
2g/3g drop

Hi,

I have my auto wcdma/gsm (3g/2g) mode active. There's a drop in network on my i9505. It sometimes gets the H+ data or E data icons. But most of the times it just stays blank (no data)

Intersetingly, when I turn on my wifi and I turn it back off (with my access point not in range or in range), I get back the H+ icon for a short moment.

This is the workaround I have been using to get the data back. I had tried

- to put phone in airplane mode and back on to see if i get data (No success)

- to put in just 2g or 3g mode (partial success but not all the time)

- to turn on and off the wifi (80-90% success)

I believe there's something going on with the wifi and the mobile radio.

I have MJ7 modem installed and might give another modem a try, but I am not sure as to what is this mysterious wifi switch doing to data.

Any comments around this. It might be helpful for some ppl. Do give it a try.

Regards,

Kiran
[Galaxy S 4 Q&A, Help & Troubleshooting] badbd09:
in my country you have to send a sms to operator for APN. would u explain a lil, how can i reload APN from sim,
[Galaxy S 4 Q&A, Help & Troubleshooting] luddeblaesild:
My solution to this was to set network mode to 2g or gsm only. This way I have full coverage to receive and make calls at least but I will have to stay on edge all the time, as soon as I change to 3g or LTE the signal drops completely and my phone becomes totally useless..

This did in fact happen for me after the 4.3 update, all was fine on 4.2.2
[Galaxy S 4 Q&A, Help & Troubleshooting] _alex74_:
yep, it is a solution even here, through the operator site you can ask for a configuration SMS that is free:good:

otherwise go to profiles, delete al exisiting APN and with left hardware button choose load default configuration or smthg like that(screenshot below is in Italian)

and yes the problems so far it is operator, same behaviour on brand new Galaxy Tab III 8, confirmed by my carrier problems here,,,,
[Galaxy S 4 Q&A, Help & Troubleshooting] badbd09:
might be the problem is for samsung device only. My frnds using nexus 4 with same carrier but no 3g issue. Guess i'll contact my carrier tomorrow.
[Galaxy S 4 Q&A, Help & Troubleshooting] Granett:
It's pretty weird.

The hardware is clearly working OK as the phone can still make calls and access the internet for a few minutes when first turned on.

But it seems like there's some setting or trigger that is switching off connections.

Once it happens there doesn't appear to be any way to turn them back on.

For me, switching to GSM or WCDMA makes no difference. The circle and bar remain in the notification area.
[Galaxy S 4 Q&A, Help & Troubleshooting] Granett:
I think maybe people are talking about different problems in this thread, so I don't know if this helps anyone else but...

My S4 on Three in the UK cannot search for available networks.

If I go into Settings>More Networks>Mobile Networks>Network operators it starts "searching" straight away (with the two options "search networks" and "select automatically" greyed out in the background) but never finds anything.

Despite what the "experts" at Three and Samsung say, I don't think this is a hardware problem, and so I cleared the RAM cache (by holding down the Home button and selecting the left hand option (the pie chart image) and then RAM and then "clear memory".

If I quickly go back to searching for mobile networks, the search is successful and I can select Three from the results and I get connected for a short time.

It seems to me that some app I have on the phone has recently updated and is now the cause of this problem. I haven't a clue how to identify that app though!
[Galaxy S 4 Q&A, Help & Troubleshooting] atifn79:
thanks for sharing i ve been facing same problem but it did not helped me have a look at my problem

I upgraded in June 2013 from an S2 to an S4 via Vodafone - since this time I have had the SIM changed, the phone has been off for repair twice and still my problems persist - the problem being that no matter where I am or which network or landline I try to ring or receive calls from my phone constantly drops calls - sometimes they last 15 seconds with a maximum being 2-3 minutes - I'm getting no assistance whatsoever from Vodafone and there solution again is to send it off for repair and then after the third time they will replace my phone - I have tried a number of things like rebooting the phone, stopping the phone app and clearing the data/cache etc, also tried changing from 4G to 2G/3G but still the problem persists?

Anyone got any ideas - my next step is to contact Samsung as the phone is still in warranty having only got it in June this year.
[Galaxy S 4 Q&A, Help & Troubleshooting] cmd512:
Exactly, there are discussions in here regarding problems that have nothing to do with the "sudden drop to no network/signal with everything coming back within a few seconds." APNs won't fix this, it's not a setting on your network either.

On that note, I'm glad to report that this random disconnect issue that has plagued my device since the first day of use has been fixed with the latest 4.3 MK8 firmware and modem. If you read back to my previous posts, I saw this issue on three different networks with three different simcards, so it definitely followed the device. I always suspected there was an issue with certain S4's hardware chips and the 4.2.2 software implementation as people that had this issue on 4.2.2 saw it go away when they went to an CM based ROM. Looks like 4.3 adequately fixes this, I'm very pleased.
[Galaxy S 4 Q&A, Help & Troubleshooting] jim1h:
I've just had an update from kies, to mk9 seems to have fixed my issues, UK Vodafone here
[Galaxy S 4 Q&A, Help & Troubleshooting] mrgold2505:
Just leave your mobile in SAFE MODE for a couple of days. Only the system aplications will be orking. That way you can se if is anotheapk you installed is making the problem.
[Galaxy S 4 Q&A, Help & Troubleshooting] jspgresende:
Hi,

I was having the network issues listed above, signal drops and later I was unable to connect to my 4G LTE network.

As someone stated before, If i changed the Network Mode to WCDMA/GSM the problem seems to disappear, but If we have a 4G phone we should be able to use it at full power so I sent an email to my network provider telling them what was happening. A few ours later they called telling me that in the week before when I came back from a trip there was a problem while registering to the network and they fixed it in their systems... 15 minutes later my 4G connection was back and so far so good, everything is working ok.

By the way I am using I9505XXUEML1 Firmware and Modem, so in my case it wasn't a firmware or Modem issue because I also tried MK9 and the problem persisted...

So if you have the opportunity, just put a working 4G card on your phone to confirm if it is a hardware or network problem.
[Galaxy S 4 Q&A, Help & Troubleshooting] shashichattar:
S4 Copy from Thailand - Network Issue

Hi,

I am in India. I have got a S4 copy phone from Thailand. Now I am facing network issues on it. I have an Airtel sim card. I get the network with Airtel, but only in certain areas and the network signal strength is also less. I get only 3G shown on the top. In preferences even if I set only GSM option for network, still I do not get network if I go inside my house. But the network is with full strength inside my house, when I use the same sim card with different phone.

Please suggest what can be done to solve the weaker network signal issue.
[Galaxy S 4 Q&A, Help & Troubleshooting] the Doctor:
Flash the right modem for your geographical region, in other words, from the Indian firmware.

http://xdaforums.com/showthread.php?t=2192025
[Galaxy S 4 Q&A, Help & Troubleshooting] shashichattar:
Thanks... but how to find which one of these is available for India?
[Galaxy S 4 Q&A, Help & Troubleshooting] Repulsa:
Check from here Which modem you need ;)
[Galaxy S 4 Q&A, Help & Troubleshooting] jon.younger:
Same issue...

I have this exact same issue on S4...4g in Norther California...drops into Airplane mode (Ghostbuster icon...circle with line thru) and wont reconnect unless reboot phone then...surprise - 4 bars of signal! OY
[Galaxy S 4 Q&A, Help & Troubleshooting] Ravi Panchal:
S4 Call drop

Hello I'm facing the exact same issue. Did you find a resolution?
[Galaxy S 4 Q&A, Help & Troubleshooting] behemot24:
me too :crying: and samsung service didn't even want to check the problem because of the knox flag being 0x1.
[Galaxy S 4 Q&A, Help & Troubleshooting] gigitravels:
I am having this problem as well, on LG Optimus L1 II, Android 4.1.2, with different carriers.

Calls drop randomly in 3G, settings can be either auto or WCDMA only, they drop in both.

** Only reliable solution is to use 2G only.

Manually switch to 3G when you want faster internet. Use a widget like "2G-3G OnOff" (free on play store) to make switching more comfortable.

I believe there is essentially no other reliable solution. My phone is low end so I was thinking I got what I paid for but no, I read this is happening with high end phones all the same, Apple too.

It's just the way things are at this point.
[Galaxy S 4 Q&A, Help & Troubleshooting] planetf1:
I had regular call drops with Vodafone UK. I believe it was the network, they stopped the instant I switched to 3uk

It's possible it was a 2g/3g handover bug in network or handset
[Galaxy S 4 Q&A, Help & Troubleshooting] gigitravels:
Update:

I broke my old phone so I bought a new one. Same Android version (4.1.2), same carrier (same sim card), basically I just upgraded from LG E410 to LG E455. Both have 1GHz CPU (single core), 512MB RAM.

The problem of calls disconnecting in 3G seem to have disappeared.

My settings are 'auto' for 2G/3G, and I am noticing the phone does switch between them (even goes to 1G) during the calls (I see it once the call ends), and the calls do not disconnect, at least so far (testing for a couple of weeks now).

Remember I am using the same carrier, same location, same Android, same apps installed, quite similar hardware specs, and close LG models.

However my new phone is visibly faster. So I would guess that the problem lies in the phone being too slow to switch between the networks in a timely manner. Those few extra milliseconds it took my old phone to do the job, caused a disconnect.

Now as for high end phones experiencing this (e.g. Samsung Galaxy), it's probably not about your hardware but about apps you have running in the background. They (or one specific app) may be taking too much resources at times, which slows down the network switching which means a call disconnect.

So try to test with clean installations. The only app I have constantly running in the background is WhatsApp.
[Galaxy S 4 Q&A, Help & Troubleshooting] bonkers1234:
Strange prob during calls :(

Hi, I face a rather strange problem - On calls, I hear the other side loud and clear. But the caller on the other side keeps complaining that my voice is feeble or there is an echo or that am far off from the mic! I thought it was an issue with the volume and mic but I confirmed it not to be so. Voice recording on a app works just fine. Also when I use the ear phones or bluetooth there aint no problem.

I have rooted my device and installed custom roms. Is that an issue? Will flashing the bootloader or modem solve? Please please help
[Nexus 4 Q&A, Help & Troubleshooting] imfromwales:
Whenever I get any notification, the screen does not come on, if the phone is locked. The screen only turns on for calls, or if i actually tuen the phone on.

Am i missing something, because I cant seem to find a setting to turn the screen on with notifications. It is stock apps, like messaging, and not just third party apps like facebook.
[Nexus 4 Q&A, Help & Troubleshooting] Thibaultvw:
That's normal, but you have to LED notification light
[Nexus 4 Q&A, Help & Troubleshooting] imfromwales:
Oh ok. I just wasnt sure as I came from TW.

LED notification light on N4 is pretty poor in all honesty, it flashes extremely slowly! I know I can download a third party app but are there any ways to change the settings of the LED flash without a third party app?
[Nexus 4 Q&A, Help & Troubleshooting] exb0:
Yeah, a custom rom.

Slightly OT, but the LED notification on the N4 is poor compared to GN. It was muuuch brighter.
[Nexus 4 Q&A, Help & Troubleshooting] DennisVu:
Yup, CM in my opinion has a really nice way of setting it up. And amen to the Gnex light, it's the only thing I've missed about it since upgrading!
[Galaxy Note II Q&A, Help & Troubleshooting] mfc123:
Hi! Everyday I have to charge my phone...is it normal?View attachment 2185917

Enviado do meu GT-N7105 utilizando Tapatalk 4
[Galaxy Note II Q&A, Help & Troubleshooting] contramundi:
do you have the battery saving option on and the auto-brightness enabled? also there's a saving option for when the s-pen is attached so less battery is consumed.

depending on how actively you use the device (gaming/video's/etc) this could be something you shouldn't really worry about