Develop Bugs

[Q] help!3G connectivity has gone from my phone

my phone can not connect to 3G networks in most of our city, while it used to work just fine in these same places. at first i thought there must be something wrong with the carrier's base stations. but today i tested my SIM card on another LU6200(Korean version of Nitro HD) and it works perfectly both on 3G and 2g networks on that phone. but when i put it back into my phone, it can only get 2G signal. if i set the Preferred Network Type to WCDMA ONLY, it got no signal with just a cross on the signal bar. i have to put it back into GSM ONLY mode to receive signal.if i go out, i can get partial 3G connectivity here and there, but not consistently. sometimes even if i have full 3G bar signals on the status bar, i can not make calls or connect to the internet.i've got this problem probably after i tried to forcibly go into the Phone Info menu.i got repetitive " the process com.android.phone has stopped unexpectedly" promps , and i just ignored it and tried again. now ,2 options are missing from the menu, LTE/WCDMA/GSM and LTE Global.in place of them, it's UNKNOWN. i already tried flashing KDZ package of no avail. Does this mean a hardware malfucntion or software glitch?Please help!Thank you in advance

No one can answer?

freefall12 said:
No one can answer?
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Ask att store for a different sim card i had lte issues and new sim card helped try that
LG NITRO-N XDA APP

Well you do HAVE GSM only selected. THATS 2G(EDGE)
for 3G you would need to select WCDMA

hyelton said:
Well you do HAVE GSM only selected. THATS 2G(EDGE)
for 3G you would need to select WCDMA
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Click to collapse
^^^So true
LG NITRO-N XDA APP

no, if i select wcdma, i got no signal.it should be hardware problem

UMTS:3 and not LTE?

So I have always had Lte on my Galaxy but now under mobile network type it says I have UMTS:3. Can anyone tell me what that even means. Also my moms house as well as my dads house both have LTE coverage, yet I can longer get LTE. When I put data on my network changes to HSpAP:15 which I also dont know what means, and yet it says 4G on the status bar. Has anyone ever had any of these problems or could enlighten me on what all of these mean?

Need a little more info, please. What ROM are you using, any mods made to your phone, stuff like that.

Yea, need more info.
I'm going to leave the book here for someone else to write, but when not on LTE, it's not unusual for your phone to read UTMS3 or HPSAP15 and for your phone to read as 4G when on HPSAP15. It's technically still 3G, more like 3G and 1/2, but ATT choose to call it 4G. You will usually see this on ATT stock ROMS and some custom ROMS, but will find it correctly reading as 3G on other custom ROMS.

Sorry for having little info there. But Im on stock rom with stock kernel. Im rooted and have done a few mods to it but thats about it. Its just weird because on ATT LTE map I am clearly surrounded by LTE coverage but am not getting it. Im going to try and put my SIM card in my sisters phone and see if I get LTE on that.

Pikezer1337 said:
Sorry for having little info there. But Im on stock rom with stock kernel. Im rooted and have done a few mods to it but thats about it. Its just weird because on ATT LTE map I am clearly surrounded by LTE coverage but am not getting it. Im going to try and put my SIM card in my sisters phone and see if I get LTE on that.
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Is that going to be the first time you've removed the SIM card?

Search "how to bypass RAT restriction"on the s3 and bypass it. Then use dialer code *#2263#. Select lte, lte all. This could get your lte back. You could also do the same got gsm and wcdma while your in there. After you finish your selections, reboot.

mrhaley30705 said:
Search "how to bypass RAT restriction"on the s3 and bypass it. Then use dialer code *#2263#. Select lte, lte all. This could get your lte back. You could also do the same got gsm and wcdma while your in there. After you finish your selections, reboot.
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That's the direction I was going when I asked about the SIM card. Removing the SIM can temporarily remove the RAT restrictions, which can allow the settings to be changed.
The RAT restrictions can be removed first by dialing *#197328640#, then hitting the numbers 11865.
Then you can dial the user code *#2263# then hit 1 for Automatic.
Please do not select lte. You cannot make calls on AT&T yet on LTE. The phone always switches back to 4G or whatever when there is a call, but never LTE). If you select LTE, then it will always be on LTE, and now you will have LTE and no phone calls. You need to select Automatic, so that the phone can dictate to you and call all the shots the way AT&T intended.

I beg to partially differ. You should select all lte, to make sure those bands are active. If they aren't, automatic won't use them.

mrhaley30705 said:
I beg to partially differ. You should select all lte, to make sure those bands are active. If they aren't, automatic won't use them.
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I'm not always right, but I think I am here. Try it on your phone. Then try making or receiving a call.

Not on Tw ROM atm. But i lost 4g data last week. Had to reselect All Lte. Also reselected All GSM and All WCDMA. Then selected Automatic. After that, everything worked right again. Lte was always lit up, until i made/received a phone call. After call, it went back up to lte.

mrhaley30705 said:
Not on Tw ROM atm. But i lost 4g data last week. Had to reselect All Lte. Also reselected All GSM and All WCDMA. Then selected Automatic. After that, everything worked right again. Lte was always lit up, until i made/received a phone call. After call, it went back up to lte.
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I'm on touchwiz. I can make calls on everything but LTE. When I set my phone, GSM always stays on Edge, WCDMA always stays on 4G (what ATT calls it) and LTE always stays on 4G LTE. They never change unless its on Automatic.

Your directions.
shortydoggg said:
That's the direction I was going when I asked about the SIM card. Removing the SIM can temporarily remove the RAT restrictions, which can allow the settings to be changed.
The RAT restrictions can be removed first by dialing *#197328640#, then hitting the numbers 11865.
Then you can dial the user code *#2263# then hit 1 for Automatic.
Please do not select lte. You cannot make calls on AT&T yet on LTE. The phone always switches back to 4G or whatever when there is a call, but never LTE). If you select LTE, then it will always be on LTE, and now you will have LTE and no phone calls. You need to select Automatic, so that the phone can dictate to you and call all the shots the way AT&T intended.
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Thanks for the directions shortydoggg, they were easy to follow. Unfortunately, I still only have Edge,.. I lost 4g after flashing 4.2.. Do you have any other suggestions?

4life2is0good said:
Thanks for the directions shortydoggg, they were easy to follow. Unfortunately, I still only have Edge,.. I lost 4g after flashing 4.2.. Do you have any other suggestions?
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Check your imei in settings. If it's a zero, you'll need to inject it back in; there's a guide for that.
Sent from my SAMSUNG-SGH-I747 using Tapatalk 2

I refer to my original instructions, with a little more detail. After bypassing RAT restrictions:
Dialer code *#2263#
Select WCDMA
Select Wcdma all
Back
Select LTE
Select LTE all
Back
Select Automatic
Back key on the phone
Reboot
You must be on a Touchwiz ROM and use the stock phone dialer.

mrhaley30705 said:
I refer to my original instructions, with a little more detail. After bypassing RAT restrictions:
Dialer code *#2263#
Select WCDMA
Select Wcdma all
Back
Select LTE
Select LTE all
Back
Select Automatic
Back key on the phone
Reboot
You must be on a Touchwiz ROM and use the stock phone dialer.
Click to expand...
Click to collapse
I have the same problem since i flashed a custom rom last week and i lost my imei too, i just inject it again but now my data and signal are always down i also fallowed ur instruction but the problem continuous, this phone is driving me crazy :silly:

Can't place or receive calls; LTE data and SMS works fine

Hey guys, just unwrapped my new N5x and popped in my sim card. Yet for some reason I can't make or receive any calls!
Calls to me go straight to voicemail, and when making an outgoing call it either immediately says call ended or after a while says network unavailable.
The strange thing is that the entire time I'm connected to LTE (full bars) and data works fine (I can use chrome), and I can even send and receive SMS!
It's been like this straight out of the box. I reset the network settings, then factory reset the device, then upgraded to 6.0.1, rinsed and repeated with no luck.
Probably related: I tried setting the phone from LTE preferred to 3G or 2G but it still says connected to LTE. Even did it manually from the *#*#4636#*#* and nothing changed.
I'm using HOT Mobile in Israel and the American version of the phone. All bands are here are supported.
Any thoughts on how to proceed?

Do US specifc models of phones normally work fine in Israel?
I know I had these symptoms when I managed to accidentally swap my UK model to use USA bands. Only potential difference is that I don't think SMS worked for me.
If someone more knowledgeable knows where the "Network settings reset" pulls values from and to, that might help.
Or which partition holds the data that makes a US phone a US version and an EU phone an EU version (assuming it isn't hardware), we could potentially flash stuff.

Yeah they do. I have a friend with a 5x and his phone is working fine. :/

Check your apn settings, re add them again to test.
Maybe your network do not support lte calls, try it on 3g. This was my solution even thought my network supported volte and worked on s6 but not on my 5x.
I see you tried the 3g option, my problem was another app causing the conflict between lte and 3g. Able to source for another spare sim to try?

I deleted the apn settings - no luck. tried 2 different service providers and same results with both
I havnt installed anything yet and wiped the phone to be sure. Could a stock app be causing the conflict? How can I check?

did you try having your friend put his sim in your phone and yours in his to see if it works?

Yep - he's on the same service provider that I am. Didn't work. Also tried a Sim card from a different service provider.

Here is a solution if you still need it http://forum.xda-developers.com/showpost.php?p=64023143&postcount=10

S4 Mini 19190 stuck on EDGE network

Hello everyone , I'm from Morocco and I need help with my device's Mobile Data.
To begin with, I've got an S4 mini 19190 3G variant, I installed a cyanogenmod ROM, it's a cm13 version, android 6.0.1. I'm using a TWRP recovery.
I've had a cm12.1 before and had the same exact problem: I'm always stuck on EDGE network .
I've gone to the settings, and made sure to choose 3G in the preffered network type.
My APN setting are correctly configured.
I've tried forcing the device to choose WCDMA by going to Phone Info. Choosing the WCDMA option disables Mobile Data and calls, with emergency calls enabled only.
Choosing the "WCDMA preffered" option doesn't change anything, it's still on EDGE.
I've looked for a solution, and noticed that some people had a problem with IMEI number, I've checked it, it's the same as the one on the back of the phone.
Anyone got any idea on how to fix this? Thank you .

Are you sure that your area has any WCDMA connection? Can you check with another phone?

Yes, I've already had H+ connection on the same phone but with a different version of the ROM, and my father has H+ working perfectly on his SGS5. I didn't try with another phone, I'll try and see if the problem comes from the SIM.

Omg Thank you! Why didn't I think of that! (How stupid of me) I tried my SIM card on a different phone (that had H+ working on it) and it went on EDGE network, and I chose WCDMA only and the connection was lost. There is a problem with my SIM card, I'm going to contact my service provider to fix this
Thanks Again!!

Samsung a3 2015 (a300fu) not finding network

Sorry, I did not find the correct forum for a Samsung a3 2015.
I have an a3 2015 that's not finding any network, I suspect the simcard en card reader is functioning because when I start the phone it asks me for my pincode and I'm able the login to the phone.
It has a valid imei, but when i try to call it says "unable the register on network"
Has anybody seen this problem before and knows how to fix it ?

That could be caused by, including but not limited to: Low signal strength (ignore signal bars, phones could select other MNOs and measure that), bands in coverage are not supported by the phone, tower or its backhaul is down for maintenance (or failure), IMEI/SIM (ask your mobile network operator anyway), circuit switching is not supported or out of coverage of the mobile network operator, the CSC in your ROM is not applied correctly for (packet switched) VoLTE (if the mobile network operator supports it on your device), antenna failure, the wrong mobile network operator is manually selected in the network settings, too much interference from neighbour cells on the same channel, bad reselection/handover, the signal has been 'echoed' too much, too far away from the tower for the timing advance, too far away from the tower for the RACH parameters.
Probably not...
Device is locked to LTE only. Or locked in some other way.

1. try to put your simcard on different phone. is it work? if yes, so your sim card reader is broken
2. have u reset your device to its default state? if yes and still the same, u have to reflash the whole rom through ODIN. if u haven't try it, do it now.
3. use another simcard on your phone, see the signal bar, is it there? if no signal, then the answer could be on the number 1 / 2.
4. what u did until u lost your signal?

I've tried the simcard in another phone, it's working.
Can the simcard reader be broken, even if it asks for a sim pincode ?
The phone was working until they pushed some updates, i've tried a factory reset but without success.
I've been reading on forums the problem could be a QCN file or a cert file ?
Is this also replaced when reflash the phone ? ( new a this, so I don't want to brick the phone.)
Where can I find the correct firmware ? Is it country related or just a300fu is fine ?
The thing i find weird about it is the phone is not showing no signal icon without the simcard insert (first icon on the link)
But shows a gray singal icon (like the second icon on the link but completely gray, without the bars).
http://newsandguides.com/samsung-galaxy-s3-android-notification-bar-icon-guide/)
update: when I turn airplane mode on and off, the signal icon is showing signal bars without a sim card insert.

Nobody that can guide me to the correct firmware ?

peter43 said:
Nobody that can guide me to the correct firmware ?
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You know the phone's model. For the CSC (country),
Use the one in your phone, there are apps to read CSC or use "getprop ro.csc.sales_code" in a terminal emulator.
Use the one of your current location/mobile network operator, the displayed 'location the CSC belongs to' on CSCs might not be accurate. It might not apply correctly.
Use a different one, but some apps might be customized differently, there are indeed some cellular configurations but it's mostly higher features, not basic functionality (though there are some). It might not apply correctly.
For the version, try an upgrade or the same version. Open the stock recovery to fully apply the CSC. For downgrades, the number in the middle of the firmware version can't be reduced. If a downgrade causes the loss of cellular, wipe data or return to the previous firmware.
In most cases I highly do not recommend attempting to restore the EFS, flashing PIT, or downgrading to Lollipop on A 2015.
The signal bars being 'blank' after an insert might be because the tower is simply distant. Calls could work on another phone if the bands (or selected RAT on the phone - 2G/3G/4G) of a nearby tower or VoLTE/VoWiFi is supported. Appears without a SIM, or could be suddenly raised with the SIM, might be because the phone has selected other mobile network operators (not related to your SIM), for measurement and limited use... you can view the transition here *#0011#, there are a few others like this but it should be enough, it is MCC(country)MNC(operator), also called PLMN ID. For the signal strength, while your mobile network operator is selected, RSSI is the signal strength of that channel, RSCP and RSRP is approximately the signal strength of the cell not canceled out by interference, ecio,ecno,rsrq,sinr,rxqual are signal quality.
Maybe the spectrum of the previously good tower has been refarmed (the frequencies previously used on 2G is now on 4G for example), or anything above, or an update somehow broke band support.
Before modifying firmware, try moving around, to connect to other cell towers of the mobile network operator of the SIM, the current band should be in 0011, check which bands your MNO uses, the list of bands the phone supports are on the internet. If for some reason the plmn id isn't in 0011 there are apps to display it.

I found out that *#0011# gives you access to the service menu.
q0000 should give access to the network modes, but this is not working, is there an other code a should use to get access to the network modes menu ?

peter43 said:
I found out that *#0011# gives you access to the service menu.
q0000 should give access to the network modes, but this is not working, is there an other code a should use to get access to the network modes menu ?
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q0000 probably does not apply to Android Lollipop and above. On lollipop and above, it's *#2263# for band selection, marshmallow, *#2683662# (and others), for channel selection and all that, even fewer on Nougat, even fewer on Oreo. Root might be required, but those codes are available in some CSCs (mostly US carrier ones) for some devices without root. Compare *_keystrings.dat in /system/etc.
For the other kind of network mode, also known as rat (radio access technology), 2g/3g/4g, apps might be able to open 4636 without root, there's the full selection.

Tried both codes but without result ...
The phone is running Android 6.01

Not registered on Network
Hi, I have the same problem with my samsung galaxy a3 2015. I tried several ways to fix it such as flashing stockrom,factory reset And even then tried a custom roms but still have this issue. This issue can be only Fixed by replacing network I.C to a New one.
Its only the problem of network i.c .