Problems with switching from wlan to 3g - Android Q&A, Help & Troubleshooting

There is the following problem with many roms on different android devices:
If you start your phone, everything is ok and you can easily switch from wlan to 3g without any problems. But after a few hours in wlan mode, 3g mode doesn't start correctly if you deactivate wlan. It seems as if 3g freezes after a few hours in wlan mode. To solve this problem, you have to switch in airplane mode or restart your cell phone.
Does anybody know, whats the reason for this problem and how to solve it?
My smartphone is a LG Optmus 2X. But the problem happens on many other devices too.
Thx.

Related

[Q] 3G-2G switch data problem

I experienced this problem with two X10, when you are on WCDMA only mode and data connection is active, try switching to GSM mode only. Your data connection will not restore until you enable then disable Airplane mode.
Anyone having this same problem? Both X10 have different manufacturing date and tried it also with different provider but same results
Mine doesn't do that. I do this all the time when I don't want to get over my limit in one day which is 1GB of data...
Mine does the same thing. I have no problem switching from 2g to 3g. But when I go back from to 3g to 2g I have to turn on airplane mode to enable data again. I am running GB 2.3.3 JVB. But the same thing happened on 2.2.1. Being searching like crazy and havent found any solution. Anybody know how to fix this? Maybe its a network problem not a phone problem.
Hi there.
I have the same problem. Do you have any news?

[Q][Help]Wifi only works 3 meters away from router

Dear All ,
I have been suddenly encountering wifi connection issues with my S3.
It refuses to connect to any router unless i am very near to it.
There is no problem with reception as the phone can detect the wifi and has 3-4 bars
If i try connecting while far away from the router to a detected network, it just gets stuck on "connecting.."
If i connect while near the router and then walk away, remains connected but I have no internet access..
Things I have tried:
1-cycling wifi on/off , reboot phone, reboot gateway
2-turning off wifi power saver from service mode *#0011#
3-flashing a different non stock rom after doing a wipe/factory reset.
4-searched extensively for three days with no avail
If any encountered such a problem before and was able to solve it, your help is highly appreciated.
marwanhamed said:
Dear All ,
I have been suddenly encountering wifi connection issues with my S3.
It refuses to connect to any router unless i am very near to it.
There is no problem with reception as the phone can detect the wifi and has 3-4 bars
If i try connecting while far away from the router to a detected network, it just gets stuck on "connecting.."
If i connect while near the router and then walk away, remains connected but I have no internet access..
Things I have tried:
1-cycling wifi on/off , reboot phone, reboot gateway
2-turning off wifi power saver from service mode *#0011#
3-flashing a different non stock rom after doing a wipe/factory reset.
4-searched extensively for three days with no avail
If any encountered such a problem before and was able to solve it, your help is highly appreciated.
Click to expand...
Click to collapse
I haven't encountered this specific problem before, but I have had other problems with my S3 and WiFi. It turned out the problem was my router, which was in 5ghz mode. If you have a 5ghz router, try to switch it to 2.4ghz.
Something else you can try is to change your modem and/or kernel. Those 2 both have something to do with WiFi, so maybe it'll work.
Again, I haven't encountered your specific problem myself, these are just some suggestions.
Sent from my Galaxy S3 with Tapatalk
marwanhamed said:
Dear All ,
I have been suddenly encountering wifi connection issues with my S3.
It refuses to connect to any router unless i am very near to it.
There is no problem with reception as the phone can detect the wifi and has 3-4 bars
If i try connecting while far away from the router to a detected network, it just gets stuck on "connecting.."
If i connect while near the router and then walk away, remains connected but I have no internet access..
Things I have tried:
1-cycling wifi on/off , reboot phone, reboot gateway
2-turning off wifi power saver from service mode *#0011#
3-flashing a different non stock rom after doing a wipe/factory reset.
4-searched extensively for three days with no avail
If any encountered such a problem before and was able to solve it, your help is highly appreciated.
Click to expand...
Click to collapse
I'm having the same problem for about 2 months now, it's driving me crazy, if anyone knows how to fix this please let us know! Thank you in advance.
AS the guy above you suggested try changing your modem and if that fails try a new kernel which should sort out the problems you are having. Or as he also suggested try your router and make sure it isnt in 5ghz mode only.
Try logging into your router's configuration and changing the wireless network channel from auto to a manual setting (e.g. 9 or 3). The only wifi problems I ever had with my S3 were (misconfigured) access points and routers.

Optimus L9 Wi-Fi problem .

I have an LG Optimus L9 P765 (Indian variant) with Stock ROM v10d on it.
WiFi on my set seems to be misbehaving. It connects to my network and works fine for sometime, but when I leave it unused for about say 5 minutes the mobile does not connects with my WiFi network.
In notification bar it shows that it is connected but actually there is no data transfer occurring.
Its very irritating as I don't get instant emails, whatsapp chats etc.
Is anybody else facing the same problem ? Please suggest any remedy for this problem.
Yeah, same problem here.
I've got an Indian P765 with V10d stock ROM as well. If left idle for sometime, the wi-fi seems to be connected but no data transfer occurs.
The small upward pointing triangle is shown on the wi-fi icon in the notification area, but the data transfer LED of the wi-fi modem doesn't blink, and so no webpage loads.
But if the wi-fi is being used continously, the problem doesn't occur.
Looking forward to a solution, thanks.
Edit: Reduced the Beacon Interval of the Wi-Fi modem to 100ms. The data connection is maintained now.
Problem solved. The phone's working fine afterall.
Before that happens go into wifi settings press the menu button hot advanced and turn the wifi sleeping policy off that is all that I can suggest
Sent from my Lg Optimus L9 P769BK using xda-premium
dz007 said:
I've got an Indian P765 with V10d stock ROM as well. If left idle for sometime, the wi-fi seems to be connected but no data transfer occurs.
The small upward pointing triangle is shown on the wi-fi icon in the notification area, but the data transfer LED of the wi-fi modem doesn't blink, and so no webpage loads.
But if the wi-fi is being used continously, the problem doesn't occur.
Looking forward to a solution, thanks.
Edit: Reduced the Beacon Interval of the Wi-Fi modem to 100ms. The data connection is maintained now.
Problem solved. The phone's working fine afterall.
Click to expand...
Click to collapse
Beacon Interval of my WiFi modem is already 100ms.
Problem still persists.
Any solution anybody.
The only solution for now is to change WiFi sleep policy to Never instead of Always in WiFi settings.
But that turns on Mobile data or 3G (which ever you have) which is more battery consuming.
And there's no point of keeping a smartphone offline by disabling either WiFi or Mobile data.
P769BK has a different wifi issue. All 6 of mine have had this same issue.
Enable wifi and use if for a few hours.If wifi router looses internet access and you try to download an MMS it fails.
Disable wifi and try downloading MMS via cellular network it fails. Airplane mode toggle does not work.
A reboot is required to fix this. Very irritating when connected to a wifi network that has a bad connection.
Don't even get me started with wifi-calling. It just plain sucks on 4.x ROMs.
I use WidgetSoid which gives WIFI and 3G icon (also called power switches) on Home Screen and reconnecting is just a HALF SECOND deal for me. Its even quickly re-connectable from WiFi PowerSwitch in Notification Panel.
By the way, I did not notice this issue on my P765 (india) L9. Works well with Vodafone Mumbai 3G, and WiFi always connected even after idle time upto 2 hours mostly at home. Like they always say, results may vary.
Problem: WiFi is not useable
Hey Guys,
i've got a huge problem. I can't switch my WiFi on. The problem exists since a few months and I've tried to fix that by myself but my knowledge about programming is quite small. Please help me. WiFi is one of the most important functions. Is sendng it to LG-Support the only way to get that fixed?
Pls Pls Pls HELP ME!
qkdfler
hi friend,
You already managed to solve your problem?. I have a similar problem, did the bootload and installed cyanongenmod 10.2 for P760 and everything worked perfectly, after I turn off my smartphone realized I was not connecting the wifi and even tapping the power button it does not turn on, put your smartphone in order factory original and still the problem continues.
Can someone help me?

About data connection after WiFi off

Hi all, I have encounter this problem since 2 month ago.
There's a way to reproduce it:
Turn WiFi on and you have to connect to any router, then you can keep data connection on.
After 30 min to 1 hour, turn off WiFi. Now data connection should working, but in my case, I can't.
Thought the data connection is enabled, it just unable to connect to the server...
I have to enter "test mode" to turn off Wireless connection and turn it on again to fix it.
Or to turn on/off airplane mode to fix this issue.
However, I've seen no one complain it here.
Is there anyone have this issue and how to solve it?
P.S I've tried all the ROM and Modem from v24p37 to v24p50

3G connection issue when device was idle (locked in pocket) for 2-3hrs. reqd reboot

Whenever my device RedmiNote3 is idle for 2-3hrs (mostly in evening when am riding back to home from office) am unable to browse 3G as phone doenst connect to 3G. the only option is to reboot. Other devices are connecting to 3G at same place, even my phone conencts to 3G after reboot. So there some serious problem with it.
I have read other threads about it too, but worry that killing 'apk qualcomm supersaver' may disrrupt other functions and if something goes really bad with this workaround, i would land my self in trouble unecessarily.
any idea what wrong?.
current MiUi version is 7.2.5.0 (stable)
I maintain my data connection by staying permanently connected to my VPN. Disabling Qualcomm supersaver doesn't really help me so I don't disable it anymore. I don't know if this helps.

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