SM-J250F 2018 -no network/emergency calls only - Samsung Galaxy J2 Questions & Answers

So I rooted my J2 (SM J250F) and one of the apps I installed is a mac address changer. I was using it to get around a 30 minute limit at airport wifi. Well I think it messed up the efs partition because after using that app I cannot connect to mobile, most of the time it will not even get a signal. The IMEI, serial # of device and model name match the sticker under the battery.
I did not backup the efs partition and I have used odin several times to get back to stock, tried kies program which told me to try smart switch, which I then had to use a older version. Smart Switch keeps saying to check serial and model name over and over even though its correct. I am a little unsure how to proceed from here. I just created the pit file and backed it up along with the corrupted (I assume) efs partition.
Anyone know what to try? I'm not worried about breaking it more as its already a expensive calculator. lol I feel like using odin and start ticking boxes under options even though I don't quite understand the implications. I read that samsung kies/smart switch -restore/initialize can put back factory settings that are unique to your phone, however that option is not working.
Edit: update, I think I may have been in a area with no service. I was at Chicago O'hare and connected to att when I had service, then in Green Bay where I had no service (tried sim cards for both att and tmobile) Now I am on the border with Canada and the phone has service on Rogers. with the att sim card. I guess the J2 is a poor international phone and I need to research the carriers bands a little more.

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[Q] Why Does my Korean N7100 think I'm roaming and not connect to mobile internet?

I bought my n7100 on taobao here in China, and it's a Korean version. I put my China Mobile sim card in, and it makes and receives calls, and text messages and can use wifi with no problem.
The only thing is the mobile data doesn't work. I rooted and tried tweakker, and HiNet, to reset my APN and MMS settings, but that didn't work. My phone still thinks I'm roaming.. it displays
this message "Data Roaming, You have lost data connectivity because you let your home network with data roaming turned off".
I've also tried updating the APN and MMS settings manualy with information i've found on the web.
I've googled and searched this forum and I can't find much. I thought it would be an easy APN settings fix but it seems not to be...
I took my phone in to the local China Mobile store they couldn't fix it. I took it to a local android expert here and they didn't know what to do.
Any ideas would be greatly appreciated.
If you bought a Korean Note 2, you don't (shouldn't) have an N7100. I also purchased one through Taobao.
You should have an SHV-E250S, E250L, or E250K. Which one do you have? Check the baseband version under Settings > About device page.
No matter what, you're going to be limited to 2G only with China Mobile.
You're right, It's SHV-E250S, and I'm fine using the 2g in China on China mobile, but I'd just like to know how..any help?
Baseband Version is E-250SKSVLJK
Try removing all modifications to your APN settings.
Next, go into Settings > More settings > Mobile networks > Network mode and change it to GSM only. Also make sure that Data roaming is not selected. Run a new scan for network operators while you're in there to refresh your APN settings to the right ones.
In data network mode I only have 2 options "3g only" or "LTE Preferred" I have it on 3g only. I have now unchecked data roaming, but I don't see any place to scan for network operators. I have included a few screenshots here, sorry i don't know how to insert them.. http://tinypic.com/r/2198djn/6 http://tinypic.com/r/24dhfmx/6 http://tinypic.com/r/2zof98w/6
Now it's obvious why you don't have data. Is this the stock Korean ROM? Are you rooted?
I can point you to a decent ROM that will fix all of this, provided you have the patience to fix it. It's relatively easy.
Yes it seems to be the stock Korean ROM. I am rooted using http://forum.xda-developers.com/showpost.php?p=31801060&postcount=2 I'm more than willing to flash another rom. I've put about 20 hours into this so far, I imagine I can muster enough patience to finish it
Once they give us a damn Korean Note II section, this kind of information will be a lot easier to find.
Try this ROM for now, it's the one I've been using for a few weeks and I love it.
Link source: http://koxda.com/thread-98683-1-1.html
ROM Download: http://pan.baidu.com/share/link?shareid=149494&uk=3355956772
Password: koxda.com
Thanks a lot the rom (715mb) is downloading now, I have tried to flash ROM's on my old galaxy nexus, and on this note II, but I never succeeded, can you please link me to a good guide, on how to flash this rom? thanks.
Odin is included in the download. If you're using Windows 7 you may or may not have the drivers for the phone, and can grab them out of the All-in-one Toolkit. Just installing the toolkit should install the drivers necessary.
http://forum.xda-developers.com/showthread.php?t=1923956
The ROM you're downloading has two files and two pictures, as well. Open the pictures and follow along. All you have to do is click two buttons, select two files, then hit start. It WILL wipe your phone.
I installed that rom you suggested, I went into settings and did GSM only, and had it automatically find my network (china mobile) selected it, rebooted, and still it says i'm roaming so there is no connectivity... any more ideas?
Can you try somebody else's SIM?
There's no reason you should not be getting service unless something is not right with your SIM or phone.
I installed the rom you suggested, i went into settings and made it GSM only, also had it automatically correctly locate my network (china mobile) and it said "registered on network".. but it still isn't working, same problem, it says no connectivity cus i'm roaming.. any ideas now?
my gf will be home from work in a couple hours, I can try her sim card then.. my sim card was cut by me for my old iPhone.. is it possible or likely that the phone can still make and receive calls, but that somehow data connectivity was affected by me cutting the card? also one guy at the phone fixing store tried his sim card (from another company) and internet worked fine he said..
dadroidda said:
I installed the rom you suggested, i went into settings and made it GSM only, also had it automatically correctly locate my network (china mobile) and it said "registered on network".. but it still isn't working, same problem, it says no connectivity cus i'm roaming.. any ideas now?
Click to expand...
Click to collapse
China mobile have various sim plans, from local to province to national. Are you using the sim in the same city in which you bought it? If not and you don't have a national plan, it could be why the phone is showing roaming. In China going from one province to another is already considered roaming unless you have a national plan. This is from my experience back 2 years ago. Also, you best check at a China mobile shop if you have data activated, gprs/edge is not activated by default, you need to ask them to do it.
I would advise you to switch to China unicom as they have 3g/hspa which is much faster than china mobile.
Sent from my GT-N7105 using xda premium
For clarfication, I am in Hainan, and the card is from hainan. I use the same sim card in my galaxy nexus without any problem. I tried my gf's card just now, it didn't say any problem with connectivity, and did not display roaming.. And it shows the G symbol (for 2 or 3 G I assume), and has up and down arrows next to it.. but it doesn't actually work for browsing the web or using apps over the data network.. I even reset all the APN settings and let it automatically find the China Mobile network, but it didn't help.. what if I try to set the APN settings manualy? and any other ideas??
Showing the G symbol is GPRS, which is 2G. You will not get 3G on the N7100, N7105, or Korean model Note 2 on China Mobile.
Sounds like you need a new SIM card. You can try to set the APN manually to make the data work with hers. I've never had to set an APN manually and I've used many phones here with all 3 carriers, so it's a bit odd to me. No clue why your card doesn't work, but since hers is working fine, it's definitely not your phone.
For the record, her card displayed G, but even after messing with settings, I couldn't get it to have working data network..
Today I bought a new card, and had it officially cut to size, put it in the note II and it's still telling me no data connectivity due to i'm roaming.. i'm so frustrated
edit: after restarting a few times and trying to automatically make it register on china mobile .. it worked on the 4th attempt.. it still displays data roaming, and I had to enable data roaming... but now it works, even though it says i'm roaming?? wtf
Ive the same problem with my Korean galaxy note 2 all voice service work perfect but when I tried to turn on data it says insert Usim Card to access network please help

[Q] Urgent, Data not working, in any way.

I have tried dozens of solutions, NOTHING seems to work, I cannot get data, on any single ROM, and build any where, any how, I unrooted it, put stock firmware on, still nothing, I go to my mobile networks, and it says WCDMA preferred, I change it to LTE/GSM/CDMA, or any other option, I have no service at all, only emergency calls!! Then in about 2 minutes, it switches back to WDCMA prefered, I talked with Bell, for my i747m, they said nothing is wrong with my data! I have tried 2 different modems, still nothing, I have no friggen clue what is going on, it all started about a week ago, I just woke up with no data, if anyone knows anything, please let me know, I need data for work and school, this **** is killing me!
Did you set up your APN correctly?
Sent from my Samsung Galaxy S III
diablo009 said:
Did you set up your APN correctly?
Sent from my Samsung Galaxy S III
Click to expand...
Click to collapse
he has lost his IMEI by the sounds of it
http://forum.xda-developers.com/showthread.php?t=1801997 for more details
Danvdh said:
he has lost his IMEI by the sounds of it
http://forum.xda-developers.com/showthread.php?t=1801997 for more details
Click to expand...
Click to collapse
I didn't really do anything, I put my data on hold (Called bell and told them to do so) and now I took the data block off and now I can't receive anymore data, tried many ROMS, many APN settings, many modems , nothing.....
EDIT: Yes I called them 3 times and they confirmed that the data block has indeed been removed, all 3 said it would be instant, I took out my SIM car and everything.
Flash to stock, same as preparing for a warranty return. Verify you have an IMEI number. Replace your Sim card. If still no good, warranty return.
mrhaley30705 said:
Flash to stock, same as preparing for a warranty return. Verify you have an IMEI number. Replace your Sim card. If still no good, warranty return.
Click to expand...
Click to collapse
I might get a new SIM card, they are relatively cheap, I did flash to stock, everything brand new (for warranty return) I do have an IMEI number, I have been starting to lose signal every now and then, randomly, I just have no bars, outside, in rooms, at work, everywhere, and what's weird is that I lose all signal, when I turn on LTE/GSM/WCDMA
Have you checked to see if the IMEI is gone?

[Q] Having some issues with my GT-I9192 Duo

So I bought a GT-I9192 Duo while visiting China (I made sure it was as legitimate as possible) but now that I'm back in my home country, I'm running into a ton of issues.
I've flashed the generic MRT firmware using ODIN and run a factory wipe to get it as clean as possible but the following issues show up:
Can't make phone calls. It says "Dialing" and then terminates shortly afterwards without actually calling
Has a difficult time keeping a data connection (3G drops out frequently)
Has the SMSC set to +7 and I can't seem to change it to my operator's SMSC
Pretty much everything that has to do with the mobile network is buggered and I'm not sure why. Any ideas?
Check the CSC. That determines what region the phone is operating in if I'm not wrong.

EXPERTS HELP I NEED TO KNOW whether its possible N910v work with 3G network

I have tried everything but in vain ,I rooted this phone via the method described on this forum and worked through version 5.1.1 unlock boot loader and root and installed any custom rom but still on the network bar an X and checked the fone still says on CDMA. I need to Kow from the developers any chance to make this fone work on 2G or 3G GSM network band 900mhz and 1800mhz ,if yes what do I need to do to achieve this ,please guide me as this fone when it came first it was working on 910F version 5.0.1 firmware while in ODIN it was 910v until when I typed *#9090# when it started the problem when I wanted to update it. I WOULD NOT MIND TO BRING IT BACK TO THE WAY IT WAS BEFORE WHEN IT CAME TO ME AS LONG AS IT WORKS ON GSM NETWORK. RIGHT NOW I FLASHED THE ORIGINAL FIRWARE ,FONE BOOTED BUT WHEN HARD RESET IT SHOWS DM VERITY FAILED AND IMEI IS CHANGED, I HAVE Z3X ,OCTOPUS,ASANSUM, AND CHIMERA TOOL TO HELP ME SOLVE THIS. PLEASE PLEASE GUIDE ME
The N910V covers the 900 and 1900 MHz bands natively so that's not the problem. In fact, to use the N910V - just to be clear, that is the Verizon model of the Galaxy Note 4 so make sure that's what you've got 100% - can use 2G/3G modes without rooting or any customization of any kind because it's factory unlocked so the only reason it wouldn't work would be either a) there's a defect in the phone itself (after it's been factory reset) or b) there's a defect with the SIM card reader, potentially a broken pin someplace in the slot and that's somewhat tough to troubleshoot or repair simply and would require replacing the entire reader or perhaps even c) you're missing the APN data that is absolutely necessary to ensure things are going to work properly. From a technical standpoint the APN data isn't necessary for basic network connectivity aka making actual phone calls or receiving/sending SMS messages but it is absolutely necessary to get the data connection working for Internet access.
I would suggest you do this:
- put your SIM card into the phone, whatever one you're hoping to use for cellular and data service, I'm hoping you understand that the SIM card has to have active service on it - and I'm not talking about the phone itself: if your intention is to use the N910V with a GSM carrier then it doesn't matter if it was ever activated or not with Verizon because it's a carrier unlocked device
- find the N910VVRU2BPA1_N910VVZW2BPA1_N910VVRU2BPA1_HOME.tar.md5 pure stock 5.1.1 firmware and flash it with Odin (phone in Download mode, of course)
- don't do anything else with the phone except flash that firmware and as soon as it's done flashing boot into the factory recovery do a wipe - the easiest way to do this after the Odin flash is watch for it to reboot the first time which will go right into the factory recovery, as soon as that ends hold Volume Up + Home and it'll reboot right back into the actual recovery then do the data/cache wipe and then wipe cache separately just in case
- let the phone boot up normally, leave it alone for 15 minutes and I'm totally serious here, 15 solid minutes, don't touch it, just leave it alone and let it boot and settle for 15 minutes
- after 15 full minutes have passed, go into Settings - More networks - Mobile networks - Network mode and set it for Global if it isn't already - DON'T DO ANYTHING ELSE, NOTHING, DON'T CHANGE ANYTHING ELSE AT ALL, then let the phone sit for 15 minutes once again
Yes I know you're impatient, we all are sometimes, but this not one of those times, you have to leave the phone alone and let it settle for 15 minutes in the step and if you're not willing to do that you may never get it working like you want
What I've learned over time is that being impatient sometimes works against you and that some smartphones - most notably Samsung models in my experience - take time to get their network connectivity on occasion so you have to be patient here and let the phone handle "business" as it needs to do. Some phones are nearly instant with a connection, others need time, so be patient, have a cup of coffee or soda or water, read a book, do something for 15 minutes and don't touch that phone.
After 15 minutes take a look at it and you should have some network connectivity, at the absolute bare minimum it should be connected to your carrier and you can make a phone call or send a text message or call customer service (usually 611). If you don't have any service whatsoever at this point then go back into the Settings for Mobile networks and set the Network mode to LTE/GSM/UTMS and - yes, I know you hate this but it's got to be done - leave the phone alone for another 15 minutes.
If after this second waiting period for the network connection to happen it still doesn't get a connection for basic cellular use - no data yet, that might not happen till you put in the APN info if that becomes necessary but that's the next step only if you get the basic connectivity working - then there's something broken on the phone. As stated above if the SIM card has service, there's no logical reason the N910V won't connect to the network for making a phone call unless there's a defect in the phone itself, something is broken or something got configured in some manner in your attempts to get it working and you're possibly looking at a phone you might not be able to get working with your carrier.
If you've got basic cellular service working but no 2G/3G/HSPA+/4G LTE service showing (that's the data connection and not the cellular which shows the signal bars meaning you are on the network) then you need to put that APN data in manually since the phone doesn't seem to pull it from the SIM card as expected. That's a step you'll have to take care of on your own as I don't know your carrier or the specifics of the APN configuration which I'm sure you can find at your carrier's support website.
Anyway, give that a shot. Best advice: stop mucking around with all the rooting/recovery/ROMs and get the phone working FIRST on the carrier's network using the pure stock ROM - once you can do that then you can worry about doing all the neat stuff and customizing things later on. If I had to guess you jumped the gun, missed something in all the experimentation you've done so far and just basically been too impatient in some situations and not let the phone settle long enough to get that connection. I've done that many times on some phones and got pissed about it only to discover that when I stopped messing with the device and just left it sitting all by itself that magically the network connection kicked in after a period of time, usually no more than 15 minutes.
You apparently have a lot of smartphone modification hardware and I'm betting if you messed with it you broke it, now it's up to you to fix it.
Hope this helps...

A505U can't access Visible network

I've tried everything, so hopefully someone can shine some light into this issue.
I bought a new (unused but from a 3rd party) Samsung Galaxy A50 (A505U) Verizon branded and unlocked. Got a sim card from Visible and went to get it connected. Nothing. WiFi works, everything works, but no cell service.
Here's what I've done (some multiple times)
- reset everything to include network settings, hard reset, etc
- removing the sim, resetting, putting the sim back in. I always get a notification saying the sim card is removed and it goes away when I put the sim back in, so it is recognizing a sim card is in there
- switched sims with another Visible phone/sim and nothing. Both sims worked on other phone but neither worked on this phone
- tried getting into the hidden menus but none of them worked
- talked to Visible tech support which upgraded the issue to the highest level and concluded it's the phone
- Visible believes it's the APN settings but I cannot edit current APNs nor add new ones (grayed out)
- manually add networks, I can see Visible, TMobile, ATT, and some weird numbers, but when I try to connect to Visible it says cannot register on the network, other networks say the sim is not setup for them
- sometimes I get the icon that shows all bars but they're grayed out, sometimes it shows 3-4 bars lit up, sometimes even shows a 4G icon, but mostly the grayed out bars
- sent the phone to Samsung, they tested it and found no faults, guess the hardware is good, ruled that out.
- got into dev options but I'm aware the OEM unlock is not on option on the A505U, not sure if I can change anything else.
I'm out of options. Any other ideas? I think if I can either get into the hidden menus I'll be able to diagnose it better, or if I can somehow change the APN settings I'll be able to set it up. Visible tech support thinks it's the APN, which makes sense to me, but I can't change them.
Any help is greatly appreciated.
I was able to get into the CSC change function, there's not many there, but would changing the CSC help? If so, which should I go to?
I've had a similar issue. Was working fine until the Android 10 update arrived. Since then, it won't work with my total wireless sim card. Tried 3 different sim cards on it, but nothing. Can't add it do anything with the APN, and getting into the phone info hidden menu doesn't help any. I suspect it's a bug in the new firmware or something like that. Works fine with a Verizon SIM though.
Update: Verizon SIM no longer connects to phone. Still works with LTE data. It seems that the CDMA radio quit working with the update to Android 10. Must have been collecting to the Verizon network with VoLTE until it updated the provisioning or something.
So, I finally figured out a workaround for mine that was able to get both data and voice networks to connect while using total wireless, which is an MVNO on the Verizon network. I pretty much narrowed it down to being an issue with the modem not working with CDMA. What I did was download the last Android 9 firmware and flashed just the modem (file starts with CP_) using Odin. After that, I rebooted it and voila! It connected.
Just thought i would give my experience as i just delt with this. i got my 10 update this morning nd let it update and apon a reboot i lost all mobile connection, a signal bar would show for a few seconds looking like it was trying to lock in a signal and it would go back to the ⌀ symbol. i tried flashing the android 9 modem from 2 different updates and neither fixed it. i just decided to order a new phone as i feel its time anyways. my next attempt will be to flash android 9 back using odin then just throw this phone up on craigslist
edit: odin successfully flashed back to android 9 and signal now works again. so if anyone has this issue you can try the method above of just flashing the modem and if that doesnt work you can go back to 9 and restore functionality of verizon mvno's
darkmage1991 said:
Just thought i would give my experience as i just delt with this. i got my 10 update this morning nd let it update and apon a reboot i lost all mobile connection, a signal bar would show for a few seconds looking like it was trying to lock in a signal and it would go back to the ⌀ symbol.
Click to expand...
Click to collapse
Out of curiosity, which carrier are you using?
TJay99 said:
Out of curiosity, which carrier are you using?
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Visible
samsung a50 not connecting to VZW towers (red pocket)
My phone is doing the exact same thing and while I can appreciate how you resolved the issue it doesn't make much sense to me.
I use Red Pocket for my network. (Which uses Verizon towers - I use the CDMA Sim)
Before this major update to 10 my phone worked flawlessly. Now it won't connect to the network much like you guys have stated in this thread. Mine will connect intermittently for like 3 or 4 min tops and then get kicked off the tower and will actually not show any bars (Circle with a line through it) to show no service for about 10 or so minutes then restart the whole process.
I also have a work phone (2nd phone) that is directly tied to the verizon towers on the verizon network. If I take the sim out of that phone and put it in my samsung a50 the samsung a50 is happy and can make phone calls, send texts, and stays on the vzw towers with no disconnects.
If I take my red pocket sim card and place it in my work phone that phone also works just fine - send messages, make phone calls, and stays on the vzw towers with no disconnects. (work phone = iphoneXR - it's free, sue me)
Even though reverting the modem obviously fixes your issue I do not think that is the actual problem. It also doesn't seem that a third party carrier is being randomly booted off the towers, it seems to be a glitch with third party carriers using third party sims utilizing this new android 10 software that VZW towers do not like.
Which obviously points to an issue with Samsung's latest software not being compatible with third party carriers.
I can't seem to contact Samsung in a direct manner to resolve this issue as they want me to take it to a third party store to have it looked at. I spent 2 and half hours with tech support from red pocket and they came to the conclusion that VZW was doing "upgrades/maintenance" to their towers in my area. (whatever that means.
Any ideas on how I can contact Samsung directly to detail this issue to them? I really do not want to have to root my phone in order to use odin to set my modem back to version 9 as I'm hearing that doing so voids all kinds of implied warranties with the phone and it's only 6 months old.
Appreciate any help that you guys might be able to steer me towards.
Thanks.
Before this major update to 10 my phone worked flawlessly- They Told you the answer, Odin # 9 or if its under warranty take it back Good luck.
My phone (SM-A505U) wasn't even working on visible before android 10.
See my post at the end of this thread: https://forum.xda-developers.com/ga...official-firmware-t3955727/page2#post83845605
I have that problem too. Where I can download v9. I got the Odin.

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