[Q] Samsung galaxy S duos2 - signal problem - Android Q&A, Help & Troubleshooting

Hi folks,
I bought the Samsung galaxy s duos2 GT-S7582, last week (sw 4.2.2). I wanted to associate my private and company sim cards into one device.
On the first sight it works properly. Until I lost signal from my provider. Both sims I used, are from the same mobile provider. At home it works properly, but in work where is a bit week signal I have a problem to reconnect, after I lost the signal. It seems to me that it doesn't reconnect automatically after I come to area where the signal is for sure, I can not even find any provider manually. I can not do and receive calls on both sims after that of course. Only think what will help is to restart the phone. After that it works properly again, until I lost signal on one of the card again.
I tried to replace the sim cards between them - doesn't help, replace one of the sim with my wife's one - same problem. I did several different settings regarding the connection, but nothing helps. I believe that this would be more-less sw problem, not the hw.
Did anybody face the similar problem? Have you any advices how to solve this issue?
Many thanks for reply.

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[Q] reception connection issues on my S3 GT-i9300 and cant find any solutions

Hey XDA,
some month ago I damaged my phone after 3 great years with it.
I bought a new one via ebay and here is the problem. He said for sure its all fine with it. There should be no problem for sure.
First I had somehow reception issues. Sometimes the connection to my provider was off and sometimes it had 3 of 4 Bars. People told me its not a flashable modem issue, but a issue where i have to change some hardware.
so did I, changed the antenna and the receiver and still nothing changed.
I always want to find and fix the problem by myself, but now i'm at some point where i really dont know what else i could do instead giving it to a repair service.
what i did? changed all modems and stockroms which I could get from the internet and install them one after another and checked my connection via "Network Signal"
the biggest issue there was, at home the connection to my provider was good and at my girlfriends home it was totally broken.
maybe anyone could help me out there?
i just read http://forum.xda-developers.com/showthread.php?t=1667326 maybe i should change the back plate where most of the stuff have connectors? like the GPS does? because if i dont have it on i wont be able to connect anywhere.
My Provider? Vodafone D2 and in other Cellphones the SIM-Card doenst have any problems with the connection/reception

No cellular network redmi 3

Hello, this is my first post on the forums here.
Iv'e purchased a Xiaomi Redmi 3 last week. It turned on fine and after the first turnoff-turn on it simply didn't turn on again and was stuck on the mi logo.
Iv'e downloaded the latest stable chinese rom and flashed using miflash and the phone started working properly again.
The problem is I do not have a cellular signal. It's either non existent (empty bars marked with 'x'), empty bars or one or two bars at most. Even when there are bars I cannot receive or make any calls (when i call the phone it just rings and the nothing happens).
The sim card itself is new (micro), the phone is new. I tried contacting the cellular company and they said everything is fine on their side, also iv'e tried the sim card on another device and it worked. I tried fiddling with different settings like changing from preferred lte to prefer 3g, adding new vpn, changing the sim card settings through the phone from WCDMA, only LTE so on and so forth and nothing worked.
Iv'e read around the forums here about the whole bootloader unlock, rooting, dev roms. I'm a newbie when it comes to these things and don't know weather I should do there and if it would help my problem.
Oh and last thing, I also verified that the device 3g/4g networks are compatible with the cellular companies in my country (same ones).
Thanks in advance,
Maybe there's a problem with ur set. I didn't root nor unlock the bootloader and reception has been fine for me from the start.
Sent from my Redmi 3 using Tapatalk
So you think it might be a faulty phone?
EDIT: I don't know if this helps or connected to my issue but i have this notification at the top saying "your SIM card isn't activated". I can't link to the pic since i'm a new user.
No one knows how to fix my problem?
I've got a similar problem I think.
I searched until I found that while flashing my IMEIs got lost and so the phone can't register to the networks.
Now I continue searching how to restore the IMEIs...
Derk

unstable signal and nothin I tried worked til now

I bought sprint Galaxy Note 3 unlocked from ebay India. Everyrhing work great in it but one problem and the biggest problem which can't be cured is UNSTABLE SIGNAL. Signal falls from full to no service and again gain network.
Did everything I can. Updated with latest stock rom, which automativally updates bootloader and modem.
Factory reset, cleaning and all, flashing new rom, changing to New Sim and trying every network Sim available.
There is nothing under the sun I didn't do.
I used this phone for a month without Sim and it worked normally without getting overheated. And I speak and chat on social sites like whatsap, Skype and it's works fine.
What is the real problem? Radio band compatability? Hardware? Antenna compatability?
I don't know what but this is the best phone I have ever used. If I can fix it, I would be the happiest one.
Please someone help.
nitin99859 said:
I bought sprint Galaxy Note 3 unlocked from ebay India. Everyrhing work great in it but one problem and the biggest problem which can't be cured is UNSTABLE SIGNAL. Signal falls from full to no service and again gain network.
Did everything I can. Updated with latest stock rom, which automativally updates bootloader and modem.
Factory reset, cleaning and all, flashing new rom, changing to New Sim and trying every network Sim available.
There is nothing under the sun I didn't do.
I used this phone for a month without Sim and it worked normally without getting overheated. And I speak and chat on social sites like whatsap, Skype and it's works fine.
What is the real problem? Radio band compatability? Hardware? Antenna compatability?
I don't know what but this is the best phone I have ever used. If I can fix it, I would be the happiest one.
Please someone help.
Click to expand...
Click to collapse
No one seems to feel like answering
Dial *#0011# key back and key input menu Q and input again 0000. Now open method information to nes and go network selection select automatic. restart ur device ! Done.

OP3 sudden loss of network signal

Hello,
Ive been facing some network issues on my new OP3 (bought 1 month back)
The phone didnt have any problem at all till yesterday when there was a sudden loss of signals in both my airtel SIMS.
OP3 is recognizing the SIM cards but doesnt show any signal. I tried swapping SIMS, my SIMS are working in other phones whereas other SIMS still dont show signal in mine.
However there were 2 instances where i regained signal and was able to make calls while is was at a particular location, but even that lasted for just 20-30 min.
I was using android vers 3.2.4 when this problem happened, tried updating to 3.2.7 (latest) but it still hasnt fixed the issue.
Thought it was a null IMEI problem, but Settings show IMEI nos. of both the SIMS
Tried manually selecting networks, mostly it says cannot connect...sometimes it doesnt do anything
Tried changing preferred networks in *#*#4636#*#* , hasnt helped either
And yes I tried soft and hard resetting too, hasnt helped.
Please do suggest any probable solutions.... Thanks You

Elephone S8 Weird issue with network

Hey all,
I am hoping somebody can guide me in regards to an issue I am facing.
I was working on my car a few days back and left the Elephone S8 on the car seat not realizing that it was being hit directly by the sun. After I was done, I picked up the phone and it was very very hot. I then went inside and let the phone cool off.
Since the above, I notice that I struggle to pick up reception. I have tried different firmware, replaced sim cards, everything. It seems to only be affecting certain MHZ bands as 4G LTE work, 3G works fine, and 2G works find but not always.
I have a feeling the 2G is having issues but maybe only certain bands. I do not think it is software related but have no idea where to even start on the hardware side. I first want to try scan for towers and see which bands they use and try see which one could be giving the issue. I don't expect it to just be a lose connector as the phone has not been dropped and I have only been using it for 2 weeks. If I do send it back under warranty for repairs, they will never pick up this issue.
Elephone S8 loss of network issue
Hi.
I think is a hardware issue as the same thing happened to me after 3 weeks perfect use.
I think has nothing to do with the sun as for me happened on a snowy Sunday 10th of December in London.
I suddenly noticed that when sending email the sending would start fast and after a 2-3 seconds the network will drop to 3G and stay like that for long time until the mail app stops sending process and the phone goes back to LTE 4G.
Also when dialling a number the phone will drop from 4G to 3G and than loose the connection straight away.
When indoors the phone would have trouble registering to network for ages without success.
I picked up 4 different pay as you go cards to make shure that is not my network but still no success.
All documented in the support ticket to GB and yesterday have send it back for a refund.
I really like the phone but i am reluctant to buy another if the issue persist so will wait and see.
Hope some more comments will follow to highlight the problem and influence a solution to this.
Cheers
I have the same issue - my wireless connection inside my home keeps dropping and connecting off and on again and again - I have two routers and maybe as I move from room to room it tries to connect to the closest router or something like that - not sure if there is a way to fix it without doing something in the routers.
Wifi
kishanach said:
I have the same issue - my wireless connection inside my home keeps dropping and connecting off and on again and again - I have two routers and maybe as I move from room to room it tries to connect to the closest router or something like that - not sure if there is a way to fix it without doing something in the routers.
Click to expand...
Click to collapse
Same problem here
My network problems are a little different. I don't have problems connecting to different wifi networks (home and work) but the phone does not activate mobile data when leaving a wifi network. I always have to restart the phone when I want to use mobile data (3G).
Kind of the same problem. Have my S8 for about a month. First it has a wifi network. When I leave the place where it is connected to wifi, it goes to 4G. But when I come back to a place with WIFI, the phone does not find any WIFI network. I have to reboot the phone. Soft reboot(a little faster) will also do/work.
Are you guys on the stock ROM?
Were you guys able to resolve your issues
MOTzYouTube said:
Are you guys on the stock ROM?
Click to expand...
Click to collapse
I have the same problems with stock rom and eragon rom. I don't have a solution but I'm still hoping for a new update.
For now I found out that turning flight mode on and off again helps to switch between wifi and mobile data, so it is not necessary to reboot the phone every time.
I can confirm as well that Eragon won't resolve 3G / 4G network issues.
I'm using my S8 for a week now with only one problem, call related.
No wifi problems but after one day of usage I couldn't use mobile data anymore I almost re-flashed my phone (unlocked bootloader, rooted and using Xposed). Turned out my provider f*cked things up. Probably because Elephone is a not known brand here. It took me some time to convince the agent on the phone that I do not own a Samsung S8 lol.
Problem was solved at the providers end.
wim69 said:
I'm using my S8 for a week now with only one problem, call related.
No wifi problems but after one day of usage I couldn't use mobile data anymore I almost re-flashed my phone (unlocked bootloader, rooted and using Xposed). Turned out my provider f*cked things up. Probably because Elephone is a not known brand here. It took me some time to convince the agent on the phone that I do not own a Samsung S8 lol.
Problem was solved at the providers end.
Click to expand...
Click to collapse
This information sounds interesting. How did you manage to 'convince' the providers agent that it is not Samsung? And what did you tell it instead?
Steve the issue you have is different. Your issue won't be resolved that way.
You would need an app that switches to 3G/4G if WiFi is not connected.
Happy too soon. After one day with mobile data it's gone again. There's a cross in the lower right corner of the mobile data icon in the status bar. I'll be calling my provider again tomorrow morning.
---------- Post added at 10:10 PM ---------- Previous post was at 10:04 PM ----------
the steve said:
This information sounds interesting. How did you manage to 'convince' the providers agent that it is not Samsung? And what did you tell it instead?
Click to expand...
Click to collapse
I'm not sure if the fact that I own a brand that is unknown here causes the mobile data problems. The problems I'm running into atm are
- mobile data problems, 4G is connected, but no internet
- fingerprint scanner doesn't work with my banking app
- backlight bleed in the middle of my screen
- after 3 out of 4 calls, phone freezes for about 30 seconds
- rattle in fingerprint scanner
I guess I'm about to find out how good the return policy at Banggood is ?
I highly recommend that you return the phone now.
There are so many issues with the phone that it's just not worth the time.
Hi guys, I just got the phone, but mobile data is not working. Am I missing something?
Can you attach a screenshot
screenshots: https://photos.app.goo.gl/1XdRma9YJacb4b2b2
Does your sim card work in another phone? If so, are the apn settings the same?
I managed to resolve the issue.
I'm trying to figure what went wrong at start. When I got a phone I inserted both SIM cards like this:
SIM 1 - my business phone number - provider 1
SIM 2 - my personal phone number - provider 2
I wanted to use data only on my personal phone number, so I disabled data on business number. What happened is my business SIM downloaded APN info on first boot (i assume), and then my personal SIM used this APN (which was incorrect).
To resolve issue I first inserted my personal SIM to slot 1 alone and booted. Then I changed APN profile to match my old phone's, turned off phone and inserted my business SIM to slot 2 and booted.
Now data works fine. Obviously there was APN issue but how come that phone didn't get correct APN settings per SIM?
Thanks for support!

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