yashsingh1/xdaforums huggingface dataset:
[Samsung Galaxy S7 Edge Accessories] ramheer:
What colour is everyone using? And is your colour a mat/soft touch? Please post pics
[Samsung Galaxy S7 Edge Questions and Answers] kgmm:
Hi all,

I have the dual sim S7 SM-G935FD running the XSP firmware. Rooted with the microSD Mod on Sim 2. It's being used in the USA at the moment. Sim 1 is AT&T and Sim 2 is T-Mobile. Both are USA sim cards. Everything goes through Sim 1 AT&T - Voice, Text and Data. Sim 2 is just for receiving calls only. Sim 1 is set at LTE/3G/2G and Sim 2 is 2G only.

Since day one I have this connectivity issue pertaining to data connection.

When Sim 2 gets a weak signal and eventually drops out, data connection on Sim 1 remains - everything works. However, when Sim 2 is picking up signal again, the data connection on Sim 1 drops out.

When this happens, the pull down notification will display that the data connection is on Sim 2 - as if the phone switches the data connection from Sim 1 to Sim 2 by itself. However, if I go to the Sim Manager, it will show that the data connection is still on Sim 1 like it originally was. At this point, the phone has no data. And yes, the phone is displaying conflicting information. Notification says Data is on Sim 2 but Sim Manager says Data is on Sim 1.

To fix this, I have to use the Sim Manager, select Sim 2 for Data. Wait a few minutes. Then, choose Sim 1 for Data again, then everything comes back normal. Data connects.

This is quite annoying in a poor reception area.

Troubleshooting steps that I have tried but they do not fix the problem-

Flash stock firmware no root

Use a different stock firmware - XEU

2 sim cards only with no microSD card on the back of Sim 2

Choose 3G/2G only for Sim 1 and 2G for Sim 2

Swapping Sim 1 and Sim 2

If I disable Sim 2 the problem goes away, but of course, what's the point of dual sim then?

I also have a S6 Edge+ Duos SM-G9287 but it does not have this problem.

Any ideas? Thanks.
[Samsung Galaxy S7 Edge Questions and Answers] schnowdapowda:
Just wanted to add that I am experiencing this as well.
[Samsung Galaxy S7 Edge Questions and Answers] schnowdapowda:
Man this is getting unbearable. Is there a specific forum for the FD devices? I'm thinking I might just return this phone while I still can.
[Samsung Galaxy S7 Edge Questions and Answers] mikereyes01:
Wow I was going to put something on boards as well with literally the exact same setup in USA. It gets way annoying when tmobile gets weak and switches even though I have it set on sim 1 data. I really hope there is a fix or else I might make the switch to htc10 (if they even get a dual sim) and keep my fingers crossed it works better. My S6 duos works better than this but I don't have additional memory with hybrid SD sim card on s7.
[Samsung Galaxy S7 Edge Questions and Answers] kgmm:
FYI -

I have been running XSG firmware. I just upgraded from APC8 to APD1 and the problem still remains.

Just trying to save some time for those of you who thinks upgrading will resolve the issue... it will not.

It is amazing how the S6 Edge+ Duos does not have this problem. Things went backwards for Samsung.
[Samsung Galaxy S7 Edge Questions and Answers] randomhkkid:
No problems here though mine is the G9250 dual sim version (HK).
[Samsung Galaxy S7 Edge Questions and Answers] schnowdapowda:
G9250 is s6 edge is it not? We are on g935FD. It seems like I can never find the elusive perfect dual sim! Always some kind of bug! Might be heading back to my Xperia z5 premium. Can you guys confirm that it's wifi causing it? Seems like whenever I come off of a wifi network it never picks mobile data back up.
[Samsung Galaxy S7 Edge Questions and Answers] mikereyes01:
That seems like part of the problem too..as soon as wifi loses connection then it switches and then no more data
[Samsung Galaxy S7 Edge Questions and Answers] schnowdapowda:
Has anyone fixed this? I have tried to flash a couple different modem firmwares to no avail. The T-mobile one won't flash as it uses a snapdragon chipset.
[Samsung Galaxy S7 Edge Questions and Answers] onurd:
Mine was doing fine until I did a firmware update and now the data connection problem appeared. I was on a B6 firmware with a B9 modem on a AFG CSC so I will try to go back to this and report back whether the issue resolves. Any firmware starting D1 (tried D3, D6 and D8) causes the data connection lost issue. Even just going back to a B9 modem with the D8 firmware didn't help. What a pain in the rear...
[Samsung Galaxy S7 Edge Questions and Answers] onurd:
Follow up to my previous post:

Officially, G935FD is a piece of crap. Tried every combination of modem/AP to get this work but no luck. Resorted to single sim mode for now.
[Samsung Galaxy S7 Edge Questions and Answers] craigg1:
I have this same issue. the only way it works is to manually select one sim in use at a time. I just removed the second sim and added a micro sd card for now.
[Samsung Galaxy S7 Edge Questions and Answers] onurd:
Did you update your firmware to a different CSC? That's when my issues started (went from AFG to BTU and even after going back the problem wasn't fixed)

What is your original CSC?
[Samsung Galaxy S7 Edge Questions and Answers] craigg1:
Mine didn't work out of the box with stock firmware. I have since upgraded the stock firmware but haven't tried using two SIMs with the latest update. Maybe I'll test it over the weekend.
[Samsung Galaxy S7 Edge Questions and Answers] schnowdapowda:
+1 on this bug existing for me since day one. I have been sticking it out and staying with dual sim as I don't have any other option. Kinda wishing I had just returned it... I have gone through hell trying to talk with people in India (where the phone is apparently from) about just getting the bug's existence up the chain. If only we could get a dev to take a look at our logs so I can have a reason to just root the damn thing already. Has anyone tried maybe flashing the sim manager apk from the s6 edge? Is there even a sim manager apk?
[Samsung Galaxy S7 Edge Questions and Answers] vietmax:
I have exact same problem with S6 edge+ dual sims. SM-G9287. Problem started since marshmallow updated. Didn't have this problem before under old android version. Has anybody found any fix yet? Right now, If I disable one of the sim, then it seems ok, but I need both sim to be on to receive call on either number.

My phone was stock firmware. Problem seems to be with Marshmallow 6.0.1 , not because of custom firmware.
[Samsung Galaxy S7 Edge Questions and Answers] psssmarina:
Kind of same problem here, but it happens only since I received the update to APD1.

I live on a border zone, so I have to force my LTE sim card to its own network. The second SIM is only on 2G.

When the phone loses its own network, SIM with LTE completely disappears, everything is moved to SIM 2G and of course I lose network. The problem is that the SIM with LTE is not seen anymore, even if I go back where the signal is, and the "mobile networks" option disappears in the Settings. I cannot do anything else the reboot the phone to see the SIM again.

Ciao Marina
[Samsung Galaxy S7 Edge Questions and Answers] GuestK0080:
I have similar issues with my s7 duos not the edge model. Sim1 tmobile, sim2 at&t. Sim2 seems to be the issue for me. Cell quality at my house is not great. I also have a xperia z5 premium dual that has similar problems mainly with lte. The samsung does hold lte signal but the bars are misleading. But the samsung, I woke up this morning and sim2 was offline no calls or text or data. Call quality with sim2 isnt as good either. I blame cell signal on that since the sony has similar issues. But I have seen it with sim1 set to calls and texts and sim2 for data the pull down says sim1 even though sim manager says sim2 is data. Wtf right? Disabling sim2 and reenabling gets it back working again but what happens when the phone does this is you lose data since sim1 data would be gsm only. The common theme is sim2? Also seems signal quality is a big factor. My CSC code is ECT which is Nigeria. I have not changed firmware yet other than the APD1 update. Ironically my xperia z5 dual didnt have these issues at all with lollipop the problems started with marshmallow. I am in the US by the way.
[Samsung Galaxy S7 Edge Questions and Answers] mirocreative:
Temporary fix?

Looks like I accidentally ran into a temporary fix, that's working for me for the last few days. I'm on Vodafone for SIM1 and T-Mobile for SIM2, EU&US.

When I restart the phone and set SIM1 for data on LTE/3G/2G it connects, but looses the connection after a while and defaults to SIM2 (with no data). No BT, no WIFI, no data icon anywhere the screen.

When this happened, I ejected the SIM card holder and pushed it back in 2 seconds. Suddenly SIM1 was trying again to connect and the 4G icon appeared. At his point I turned on WIFI.

The weird stage: WIFI on, 4G icon flashing every 5secs – but it's working as it should. If I loose reception, it does not switch cards. Actually never switches card if I don't want to. I can live with the flashing 4G until we have an official fix.

Let me know if it works for you guys!
[Samsung Galaxy S7 Edge Questions and Answers] GuestK0080:
Im learning that mine is a lot more stable if I set everything to the same sim and not split up talk/text on sim1 and data only on sim2 like I was doing. Not sure if this is placebo for now but I have everything set to sim2 and so far so good with no drops.
[Samsung Galaxy S7 Edge Questions and Answers] mirocreative:
I had set everything to SIM1 and it was still dropping data and switching to SIM2. Weird.
[Samsung Galaxy S7 Edge Questions and Answers] xxmwxx:
I'm having the same issue with my new G935FD, even when using the latest G935FXXU1APES firmware... hopefully Samsung/google will fix this issue asap, it's super annoying.
[Samsung Galaxy S7 Edge Questions and Answers] :
My G930FD did the same thing multiple times tonight. I was in a weak tmobile area....shocker. Everywhere near me seems to be a lousy tmobile coverage area which is why sim2 is at&t. Sim1 must have been bouncing from weak to moderate. So then sim1 data took over and of course sim2 had been active for data meaning sim1 was gsm. So that killed my data. Only way i could prevent that was to turn off sim1. At least a call would still get forwarded. So when I got home I enabled sim1 and if this damn phone didnt once again pull the same crap and switch sim1 to data again! Which then killed data since it was gsm only once again. I cant believe Samsung hasnt addressed this!
[Samsung Galaxy S7 Edge Questions and Answers] guztavo1:
I have the same problem. 935FD. Data just dissapears and i have to manually change data to sim1 and sim2 to make it work again. It sucks. Any workarounds are appreciated
[Samsung Galaxy S7 Edge Questions and Answers] xxmwxx:
This seems to be working... I have the same behavior with the 4g icon flashing every few seconds, I wonder if it drains the battery faster
[Samsung Galaxy S7 Edge Questions and Answers] tstolz33:
Yeah, I'd love to know about the impact on battery life, if any. What firmware are y'all using? And what has your battery life been like on the FD version? SOT time, total time, etc.
[Samsung Galaxy S7 Edge Questions and Answers] xxmwxx:
Hard for me to say right now, cause my phone is still new. I've been installing a bunch of stuff and restoring all my data so battery life will def not be good.

I have noticed quite a few wakelocks yesterday so i'm trying to see which app/process is locking my phone, it just takes a bit to do without root (and the convenience of betterbatterystats)
[Samsung Galaxy S7 Edge Questions and Answers] mirocreative:
Well, I still get over a day with normal use on LTE/4G all day. I can live with that as long as I have data all the time.

Baseband is G935FXXU1APD1. I guess the fix should work with the newest firmware too, I didn't upgraded 'cause Samsung Pay is working fine with this FW.
[Samsung Galaxy S7 Edge Questions and Answers] tstolz33:
Not bad. What kind of SOT is that with? And what country/provider is that firmware version?
[Samsung Galaxy S7 Edge Questions and Answers] mirocreative:
I'm using the UAE unbranded. Samsung Pay...I couldn't get it working with the UK unbranded files.

CSC: G935FOJV1APD1 / XSG (UAE)

Bootloader/PDA: G935FXXU1APD1
[Samsung Galaxy S7 Edge Questions and Answers] schnowdapowda:
So still no fix for this? I just broke my Xperia Z5 so i guess I'm stuck with this garbage phone for the time being.
[Samsung Galaxy S7 Edge Questions and Answers] psssmarina:
I have ECT code as well, the SIM is a SWISSCOM. Problem not yet solved

Ciao Marina
[Samsung Galaxy S7 Edge Questions and Answers] graystreet:
Having the exact same issue--with a SAMSUNG GALAXY S7 DUOS G950; android 6.0.1 and using AT&T and T-mobile in the US.

Regardless of what SIM slot T-mobile is in or data network specified--the phone wants to switch to said slot for Mobile Network.

Extremely annoying as I can't access the internet/Gmail with the T-mobile network, though I can send/receive texts from both SIMS

Anyone have a fix?
[Samsung Galaxy S7 Edge Questions and Answers] joegalaxy3:
Hi am happy to see that the discussion about the s7 edge duos is taking place here because I've been looking for it for some time now.i personally believe Samsung will send out an update to fix the network problem. There is one thing I will like to know about the second sim please is it 4g compatible ? I mean can you choose to use the second sim like the first sim on 4g lte ? Thanks.
[Samsung Galaxy S7 Edge Questions and Answers] psssmarina:
Hi,

hi finally solved the problem installing the new firmware version for Italy G935FXXU1APF2 G935FITVAPE2

And about your question: both the Sim can be used in LTE, only one at the time of course.

Ciao Marina

Inviato dal mio SM-T525 utilizzando Tapatalk
[Samsung Galaxy S7 Edge Questions and Answers] joegalaxy3:
Thanks for the information.so we are talking about the model sm-g935fd ?
[Samsung Galaxy S7 Edge Questions and Answers] schnowdapowda:
confused. are you using APF2 or APE2?
[Samsung Galaxy S7 Edge Questions and Answers] acale:
Can anyone else confirm if this problem is fixed with a firmware update to APF2 ?
[Samsung Galaxy S7 Edge Questions and Answers] acale:
I'm going to try this myself and will report back.
[Samsung Galaxy S7 Edge Questions and Answers] kgmm:
I can confirm that the updates below does NOT fix the problem.

XSP APDQ

XSG APF2

Don't waste your time. I did it already.
[Samsung Galaxy S7 Edge Questions and Answers] psssmarina:
Well it did for me, I can cofirm it works very well now. I changed from ECT to ITV , using the new version of the software. Maybe it is something related to some regional settings?

Inviato dal mio SM-T525 utilizzando Tapatalk

---------- Post added at 09:43 PM ---------- Previous post was at 09:41 PM ----------

PDA APF2

CSC APE2

Inviato dal mio SM-T525 utilizzando Tapatalk
[Samsung Galaxy S7 Edge Questions and Answers] schnowdapowda:
Holy cow it works I think!!!

---------- Post added at 01:13 AM ---------- Previous post was at 01:09 AM ----------

Everybody needs to go check the latest Italian G935F firmware from Sam Mobile. I really think this is the one!
[Samsung Galaxy S7 Edge Questions and Answers] acale:
I installed APF2 - APEQ yesterday (France - XEF). Will update here if this also works (need to go out to create the problem).
[Samsung Galaxy S7 Edge Questions and Answers] schnowdapowda:
Did you try the Italian version?
[Samsung Galaxy S7 Edge Questions and Answers] acale:
4 days now and not one data disconnect requiring a reboot. The above French firmware version(s) (in addition to the Italian version(s)) seem to have fixed this particularly serious data connectivity bug for the SM-G935FD Duo :good:
[Samsung Galaxy S7 Edge Questions and Answers] schnowdapowda:
Same here
[Samsung Galaxy S7 Edge Questions and Answers] onurd:
Great to hear that. Did anyone try to activate Samsung pay on these firmwares (Italian or French) in the US? I assume it won't work?
[Samsung Galaxy S7 Edge Questions and Answers] :
I have the ECT CSC version of the latest firmware. Got the update today which seems a little slow at receiving updates. Anyway I havent noticed a difference. Simply enable SIM 1 after it being disabled and the phone switches data to it and of course since it was not enabled for data youre dead in the water until you switch it again. Not fixed in my opinion.
[Samsung Galaxy S7 Edge Questions and Answers] wesley76:
I do not get it fixed with that update.

Enviado de meu SM-G935F usando Tapatalk
[Samsung Galaxy S7 Edge Questions and Answers] slammly:
Im from the states, and have had same issues as OP. Same Issue, same phone, both sims are t-mobile usa, and had tried all steps OP tried. Only thing I'd say is differnet about the situation is root. I have not unlocked bootloader or rooted yet. so we can rule out ROOT as cause of the issue.

I've been playing around with different firmware. Been having the same problem as OP, and been trying to try different firmware. Just flashing different csc code did not fully fix the problem. So i downloaded full firmware with bootloader csc ap and cp files. I went through a couple.. I tried the suggested france and italy and few other firmware and had no luck. I' had previously loaded the BTU (UK) Home_CSC on the french or italian versions with no luck. THEN... i downloaded the full BTU zip and loaded all 4 files into odin.

My messege centre number was deleted and mmsc was blank. so apn and text message centre need to be set. after setting apn and messege centre number, im having 4g consistently now, and so far, no funky mobile data switching from sim 1 to sim 2 and getting stuck without returning to 4g. Now, when im not on wifi, i have 4g, but when on wifi, the 4g icon disappears, but when i turn off wifi or leave the house, 4g pops right back instantly (compared to never coming back to 4g (or even have mobile data) previously)

If BTU firmware does not work for you (it didnt for some), I reccomend trying other firmware ('ve heard PHN for netherlands is one to try also, but I used BTU first and it worked).

also, if you can't wait for download from sammobile, there is a thread on XDA to download samsung firmware and super high speeds. search for SAMFIRM. I put in sm-g935f in phone model, then search BTU for region. the software will find latest BTU firmware you can download.

I had a very stressful time trying to get my data to work once i left my wifi network. problem is solved for me so far using BTU ap, cp, csc, and BL downloaded through samfirm. Hopefully this helps anyone with this annoying data connectivity issue.

as an end result after figuring my 4g works consistently, I factory reset and wiped cache before setting up as new device. will update if anything changes.

For the end of this post, Id like to give a huge shoutout to SAMFIRM dev(s). it really made life a lot easier not having to wait 2-9 hours per firmware download (samfirm can grab entire zip in about 20 minutes or less!!). THANK YOU!!
[Samsung Galaxy S7 Edge Questions and Answers] :
My problem with this issue somehow went away on its own. Only thing I did was switch my tmobile sim to at&t so now both my sims are at&t. Issue has not returned and I used to be able to reproduce it at will. Find it hard to believe it being carrier related but who knows. Tmobile coverage in my area sucks anyway.
[Samsung Galaxy S7 Edge Questions and Answers] kgmm:
Update - XSG - APG3/APF1 firmware that was released on 7/22 seemed to have the problem fixed. 3 days and counting so far and no issues.
[Samsung Galaxy S7 Edge Questions and Answers] mikereyes01:
Shoot i might try that. Just use another att instead of T-Mobile
[Samsung Galaxy S7 Edge Questions and Answers] gavjs:
I am having similar issues here.

Prior to updating to the suggested Italian firmware, sim1 was not registering properly and data was not working. After the firmware update I can now get 3g but I cannot get LTE, and sim is still not registering.

Anyone have any ideas on how I can fix this?

Thanks in advance!
[Samsung Galaxy S7 Edge Questions and Answers] onurd:
Even with the latest XSG firmware, At&t sim card in slot 1 and t-mobile in slot 2 still doesn't work for data. I keep on losing data on slot 1. What a pain.
[Samsung Galaxy S7 Edge Questions and Answers] soleilombre:
I have the SM-G930FD, the regular S7, carrier unlocked from UAE. It's got the stock android 6.0.1 on it.

I have a T-mobile SIM in slot 2 And a Thai SIM in slot 1. I bought this phone specifically to have my US number available while in Thailand, but a few minutes after I start using the Thai SIM, the situation others have described is happening. I lose all data connection and it looks like it switches to T-Mobile.

This is a stupid question but how hard is it to load an Italy or France firmware to see if that solves the issue? I don't want to root the device. After I do that will I be able to get automatic firmware updates or will I have to download them each time?
[Samsung Galaxy S7 Edge Questions and Answers] copajoe:
I also have the same problem

Samsung Galaxy S7 Edge Duos.

when I first purchased it I had 2 T-Mobile chips in it and the internet would switch randomly or just switch off. Then I pulled one T-Mobile chip out and put in an ATT chip. It seemed to fix the problem BUT I do not use ATT

I live in Brazil and use TIM as my local carrier but also keep the T-Mobile sim to get texts from the US.

Now this wont work. The data will not work when I have both sims switched on.

When in Brazil, TIM is in the Sim 1 card slot. If both chips are on, Internet switches to sim 2 but the T-Mobile chip does not even have internet available on it when in Brazil.

If I switch off sim 2, internet works on sim 1

Today, I arrived back in the states. Tried to get T-Mobile Internet on Sim 2. NOPE, it switched to TIM which does not work in the states.

Tried turning sim 1 off and it still did not work. I actually had to REMOVE sim 1 (TIM) chip to get the T-Mobile internet to turn on.

WTF? if they cannot get this right, it was a complete waste of the extra $150 I paid for this (over the single sim version).

DOES ANYONE KNOW WHAT TO DO????

I read that a few of you have figured out fixes but I have NO IDEA what you guys are talking about. My phone recently did a software update (around 8/25 or so) but the problem still exists.

what are you guys doing and how can I? sorry I have no idea how to root or add stuff like you!

thx
[Samsung Galaxy S7 Edge Questions and Answers] soleilombre:
I'm not sure if this will help anyone, but I went to a Samsung store two days ago, and the employee there took my phone and first she messed up my APN settings, and then she reset all my app permissions/preferences. At first I was annoyed, but after I fixed the APN settings, my phone has been working steadily for the past two days without mysteriously trying to switch to the other SIM and dropping the connection. So maybe some sort of app permissions were causing the SIM card wonkiness? Can't hurt to try resetting them.
[Samsung Galaxy S7 Edge Questions and Answers] onurd:
What provider are your sims?
[Samsung Galaxy S7 Edge Questions and Answers] soleilombre:
T-Mobile (US) and TrueMove (Thailand)
[Samsung Galaxy S7 Edge Questions and Answers] onurd:
I will try but I remember using a brand newly flashed phone with the same issues. Granted I am on At&t and Tmobile (both US) sims and that might be the issue.
[Samsung Galaxy S7 Edge Questions and Answers] copajoe:
What app settings were changed? from what to what?

everyone with this issue seems to be using T-Mobile with one or both sims.

its hard to believe it is sim card related but it looks like it to me.

for me, I am screwed because at+t does not work in brazil. it has to be T-Mobile for one of my sims.
[Samsung Galaxy S7 Edge Questions and Answers] hansgraff:
Anyone have a fix for this yet? I'm still having this issue constantly.