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[Q] LG Optimus Black internet problem

Well recently i bought a LG Optimus Black, at the begining internet and all worked just fine, and now suddenly i cant connect to internet.
I am able to connect to a wifi network, but 3g wont work, how can i fix this?
Every opptions are right.
I tried the same sim card in Samsung GalaxyS2 and some other phone, it works fine. So it has nothing to do with the SIM.

try to configure your 3g network, look for it on the internet.
i only had this problem when i install NOVA ROM, but it was easy to solve the problem.

I have tried but not helping.

Is it running on Stock ROM or NOVA?
Just like lucasmalaguti said, this problem happens only on custom ROMS.
Anyway, just check your settings.
Settings > Wireless & Network > Mobile Network > Access Point Names
Search on the internet or ask your provider for the setting configuration.
Also, if you have a few Access points, Eg. MobileInternet1 & MobileInternet2, make sure the right one is checked.
Download APN Backup & Restore app from market to delete and re-add Access Point.
Once edited/add, reboot phone for changes to take effect.

Check your APN settings
Sent from my LG-P970

I'm running a stock V10E ROM
My APN settings are OK (sent from my provider)
Tried to manually add it, but nothing helps

Today i called LG Service support.
They say that i am not the only one with this problem.
The problem seems to be caused by automatic software update (V10A => V10E).
Only solution is to reflash ROM.
So i did that and now everything works fine.
Thank you all for trying to help!

I have same problem, how do i re-flash to the old fw
Hi, I got same problem please tell me how can i re-flash my previos fw? thanks.

Hello! I'm newbie
I have the same problem. Please help! What is this ROM? How can I do this? Can this really fix my internet problem? thank you

Had same issue, thought it was the carrier but it could be the phone, hope this helps
1. turn off your OB and take the sim off
2. test the sim's 3g on some other phone
If it's working
3. put it back in your OB = problem solved
It it's not working
3. call your service provider

no internet connection via mobile network

Hello. When I turn internet connection via mobile network nothing happen. There is no icon letter icon next to my signal strength. Restar phone doesnt help. Any ideas?

mateusz3112 said:
Hello. When I turn internet connection via mobile network nothing happen. There is no icon letter icon next to my signal strength. Restar phone doesnt help. Any ideas?
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Click to collapse
I have a similar issue.. but only when I use a Stock Rom..
When I use a CyanogenMod based rom I connect normally.
Any suggestion if there's an option, in build.prop maybe, so I can fix this in a stock rom?

hi, you use a rom from XDA? is it happen after flashing a new rom, first boot, no mobile internet? -> how about some informations about runnign system etc. pp. was it working before with same rom? and so on....
if no internet after first boot: turn on wifi, go Settings/Xperia/Internet Settings , and try download the settings with wifi. how that?
second thought: your provider's fault?

Xperia V is not officially supported by my carrier, but I can use mobile data on cyanogenmod.
I tried to add APN for my carrier, but they don't appear, using APN Manager I could see and try to apply them, only to get an error.
I was willing to go back to stock rom 'cause I wanted to use sony's camera.. but mobile data is essential.. guess I'll to stick with cyanogenmod..

i have added my provider (three uk) network apn manually and it worked.. yesterday.. Now still I cant connect. No reaction at all. I've downloaded settings via wifi and didnt help. Im running official rom 9.1.A.1.141. It is not a provider fault - I used o2 before and it was the same problem. Sometimes restart helps. but not now,
edit. now restart helped.. i dont get it.. This is very enoying

Anyone have any ideia how to fix this issue?
In CM all APN are shown correctly, in any stock based rom I can't add any entries, or it's not shown.

Trouble on wifi. Will this fix it?

Hi. So, I just got a Samsung S3 GT-I9305 from Vodacom. Got it from eBay. But, I'm having trouble connecting to the wifi. Whenever I connect to the wifi it always says "Authentication error occurred". I turned off the wifi thingy using *#0011# and wiped the cache, I even reset the phone to its factory settings. I sometimes connect to a wifi, but it takes 1 hour or so before being connected. And I have trouble downloading from the playstore. Did everything I could find from the web. No luck.
So, I was thinking, If I would flash a custom rom to my device, will it fix the wifi issue? And would any stock firmware of the I9305 device work?
Thanks! Sorry for being noob.

Denzel07 said:
Hi. So, I just got a Samsung S3 GT-I9305 from Vodacom. Got it from eBay. But, I'm having trouble connecting to the wifi. Whenever I connect to the wifi it always says "Authentication error occurred". I turned off the wifi thingy using *#0011# and wiped the cache, I even reset the phone to its factory settings. I sometimes connect to a wifi, but it takes 1 hour or so before being connected. And I have trouble downloading from the playstore. Did everything I could find from the web. No luck.
So, I was thinking, If I would flash a custom rom to my device, will it fix the wifi issue? And would any stock firmware of the I9305 device work?
Thanks! Sorry for being noob.
Click to expand...
Click to collapse
Hi,
I think it could be a router issue. You should :
- reset your router and retry to connect with your i9305,
- play with WIFI network settings in router. Maybe something doesn't allow your i9305 connection (network type, firewall, etc.). I'm not an expert in router settings, so you could google this to help you.
- try another WIFI network (from a friend, at work, anywhere you can test )
I think that flashing a custom ROM won't change anything. First try to fix your problem with stock firmware.

Unsolved bizarre 3g network problem in s advance i9070

I flashed a JB INDIA official firmware via odin to solve bizarre 3g problem in i9070.
At first it seems the problem solved, because I saw the H/3g i next to the signal bar, I browsed the net....everything was just breeze....but just after two minutes.... ... the damn thing again happened.
I then reset to factory settings and cleared my cache nd all that , and I got fresh apn from my carrier,crosschecked net work availability from others..it was fine but when i activate the data network mode, the icon's missing again and the internet doens't work.
still 2g is working fine? this wiered thing happens with 3g(WCDMA ONLY) MODE.
http://cdn2.xda-developers.com/images/smilies/confused.gif
has anyone any solution.

http://forum.xda-developers.com/showthread.php?t=3150310
I know , it wasnt tested on stock , but it should solve your problem

SM-g800F 3g and 4g problem

Hello,
My 3g and 4g are not working on my s5 mini (SM-G800F)
When i turn the netwerkmodus on LTE/WCDMA/GSM automatic i get Emergency calls only. When i turn the modus on only GSM(2g) i have signal back.
How can i fix this i run the stock android 5
Roan

roanbbb said:
Hello,
My 3g and 4g are not working on my s5 mini (SM-G800F)
When i turn the netwerkmodus on LTE/WCDMA/GSM automatic i get Emergency calls only. When i turn the modus on only GSM(2g) i have signal back.
How can i fix this i run the stock android 5
Roan
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Click to collapse
Hi everybody (and sorry in advance for my poor english) !
I am having exactly the same problem as the OP. To explain the situation in a nutshell:
I have the SM-G800F, for about a month. It worked fine, until I moved to the other end of France (it probably has nothing to do, though). Passing on the highway, "Emergency calls only" showed up while I was looking at my emails. The problem is that things never got back to normal.
The situation :
As I said, the same as the OP. When I turn on my phone or I go out of airplane mode, my phone tries to connect to 2G, then 4G / H+. The process takes a few seconds, then any indicator (left of network "bars") disappears, and I can't issue or receive calls, nor use data.
But if I force "2G only", everything works just fine.
I was using a rooted 5.1.1.. In the meantime, I tried several suggestions found here or elsewhere:
-Turn off the phone and on again : Nothing
-Enable / Disable flight mode: Nothing
-Remove / Replace the SIM card: Nothing
-Putting the sim in another phone: everything works just fine, so the problem may not be a faulty sim card
-Wipe Data / Cache Data then use Odin to reinstall a stock 5.1.1 rom (I'm really a noob to find the right words, sorry in advance, but my phone says, under the "version number" field , LMY47X .G800FXXU1BPC4 and the ROM I used is named : -G800FXXU1AOG2_G800FOXX1AOG1_G800FXXU1AOG2_HOME.tar.md5 filename
Manual carrier selection : Nothing
-Turn on Data Roaming : Nothing
-Checker my APN : Everything seems just fine
I can't tell for sure but I do not think it is related to my home. My problem began on the road and took the rest of the trip (2h/3h), and even around in the city, it remains. Moreover, my backup phone and the other people on the same network as me (Orange) don't encounter this problem.
So, I'm a little bit confused and a bit worried because of Knox (0x1: /). If you have opinions, advice, guidance, thank you very much in advance!
Joël

roanbbb said:
Hello,
My 3g and 4g are not working on my s5 mini (SM-G800F)
When i turn the netwerkmodus on LTE/WCDMA/GSM automatic i get Emergency calls only. When i turn the modus on only GSM(2g) i have signal back.
How can i fix this i run the stock android 5
Roan
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Click to collapse
figure anything out? just had this happen to me as well.

civicsr2cool said:
figure anything out? just had this happen to me as well.
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Click to collapse
No, I really don't know what the problem is I think it's something in the phone itself

I've got the same problem too
Did you find the cause of this issue in the end?

adamh22 said:
Did you find the cause of this issue in the end?
Click to expand...
Click to collapse
Hi !
Not yet ... I have another phone now but i still try now and then to fix my S5 mini.
So far, nothing worked. Some tech guy told me it was a common issue with that phone's antenna. Also read that from several forums.
Still, i read that some users were able to fix similar looking issues by flashing the modem file with Odin. I'm a bit n00b but i guess i'll give it a try.
Any success on your side ?

You can try searching for your carrier manually and choosing it.

Mrdream94 said:
You can try searching for your carrier manually and choosing it.
Click to expand...
Click to collapse
Thanks, but i already tried that many many times. My S5 Mini just displays "Network XXX unavailable" (or its nearest equivalent in French)
Did any of you manage to fix that by flashing your modem file with Odin ?
I've tried additional stuff but nothing seems to work. Back to stock Marshmallow. Still loosing radio signal whenever I enable 3/4G.
Maybe the bottomline is "hardware failure" but who knows...
Thx everyone!

seelebrn said:
Thanks, but i already tried that many many times. My S5 Mini just displays "Network XXX unavailable" (or its nearest equivalent in French)
Did any of you manage to fix that by flashing your modem file with Odin ?
I've tried additional stuff but nothing seems to work. Back to stock Marshmallow. Still loosing radio signal whenever I enable 3/4G.
Maybe the bottomline is "hardware failure" but who knows...
Thx everyone!
Click to expand...
Click to collapse
Have you tried a deep reset? If it does not works, try a custom ROM...

Hi !
Thanks for your reply,
I did try "Factory Reset" and "Wipe Cache" while in the Recovery Menu (Home+Power+Vol Up if I remember well). Is that what you were refering to ?
But I think I didn't try flashing a custom rom. Could you recommend one ?

seelebrn said:
Hi !
Thanks for your reply,
I did try "Factory Reset" and "Wipe Cache" while in the Recovery Menu (Home+Power+Vol Up if I remember well). Is that what you were refering to ?
But I think I didn't try flashing a custom rom. Could you recommend one ?
Click to expand...
Click to collapse
Yes I was meaning this. For a custom ROM i can recommend One of the latest with NOUGAT like Lineage OS 14.1

Mrdream94 said:
Yes I was meaning this. For a custom ROM i can recommend One of the latest with NOUGAT like Lineage OS 14.1
Click to expand...
Click to collapse
I'll give this a try and keep you updated, thanks !

Mrdream94 said:
Yes I was meaning this. For a custom ROM i can recommend One of the latest with NOUGAT like Lineage OS 14.1
Click to expand...
Click to collapse
Hi,
I installed Lineage OS 14.1, it's great but the same problem keeps happening. Everything works just fine in 2G, but whenever I enable 3G or 4G, my phone looses radio siglal and switches to "Emergency calls only" after a few seconds.
Any other thoughts ?
Thx !

As a side question, would you think of any way to rule out/confirm the possibility of HW failure ?
Thanks again !

Did anyone found solution for this?

Hi,
I've got the same problem. Tried to flash with Lineage 13.0, then 14.1 and still the same problem.
Anyone help?

Flash the last modem/baseband, did yoy try *#*#4636#*#* ? You can manually select wcdma only(3g) or lte only(4g) (sorry for my bad english)

still not working

When I choose 3G/2G auto connect from 1 line ti go to 4 signal.. so no LTE /4G for now..