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[Q] I have HSDPA service, but 3g refuses to function!

When my phone shows the H symbol for network, it works well, but when I'm not using the network (no traffic), it falls back into 3g and gets stuck on upload. Occasionally, H service will come back, but often it won't. I have found if I turn the screen off, H service is restored.
I have had this problem for months now. I have a i9020a. Currently I have CM9 April 8th nightly installed, using the i9020AUCKJ1 radio. I just got done reverting to the stock build recently released from Google (IMM76D, I think), then upgrading to CM9.
No matter what I've done, nothing has worked:
1. reverting to stock then upgrading to a custom rom (Team-Kang, CyberGR, CM9, etc);
2. trying different radios;
3. opening phone info (*#*#4636#*#*) and changing it to GSM auto PRL as well as setting the band to USA;
4. making sure the APN is correct;
5. restoring the IMEI backup;
Any ideas what the issue could be?

H is 3G. Only active while data is being actively sent/received and it is actually feasible to use in your current area. Also, are you sure it is not only the animation that gets stuck?
Is there an actual problem, though? Is something not working quite right (data, sync, notifications, etc)?

It gets stuck on UMTS:3 (just keeps trying to upload) and won't work again until I turn off the screen and then it will usually revert to HSDPA:9.
Sent from my Nexus S using Tapatalk

chrisnathan1983 said:
It gets stuck on UMTS:3 (just keeps trying to upload) and won't work again until I turn off the screen and then it will usually revert to HSDPA:9.
Sent from my Nexus S using Tapatalk
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you should download taskiller.. kill all app before you use your internet, i have same problem and always solved with that way..
hope this helping
Sent from my GT-I5500 using Tapatalk

While taskiller certainly kills most running processes, it does nothing to help my network connection.
On a separate note, my roommate has the same phone and his maintains a steady HSDPA:9 connection without ever dropping into a UMTS:3 connection.
Sent from my Xoom using xda premium

chrisnathan1983 said:
While taskiller certainly kills most running processes, it does nothing to help my network connection.
On a separate note, my roommate has the same phone and his maintains a steady HSDPA:9 connection without ever dropping into a UMTS:3 connection.
Sent from my Xoom using xda premium
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The normal behavior of the phone is to use HSDPA while it's in need(download/upload) , when not in use automatically goes to UMTS:3
What ROM your room mate is using ? model ? radio ? network ?
---------- Post added at 07:43 PM ---------- Previous post was at 07:36 PM ----------
Gasashi said:
you should download taskiller.. kill all app before you use your internet, i have same problem and always solved with that way..
hope this helping
Click to expand...
Click to collapse
You're talking totally rubbish ... Killing apps will not enhance anything and may even slow things down by needing more CPU power to open auto apps again...

I have expereinced the same issues with my 9020a on ATT. Sent phone to Samsung twice, changed SIM cards 4 times. Updated radios, now on 4.0.4 getting about 120 kbps download speeds while my other phone (work phone), iphone4s on att, gets about 5 mbps.
Call att, they credited me my entire months bill and offered a free galaxy note with a 2 year agreement. My thought is that ma' bell is just killing any unlocked phone or there are issues related to "LTE" rollout they wont admit to that is causing a disruption with 3.5G.
Anyways to the OP, you aren't alone. I too hope someon can help!

My roommate is using the same rom, CM9 (nightly from 3/29 though), radio is i9020xxkb3, network is also AT&T with same plan.
Watching the About Phone/Status on his phone, it stays on HSDPA:9.
My returns to UMTS:3 when not in use, but when in this mode, I get no network traffic at all. I will flash upload but will never download anything. Occasionally, H service will be restored, and I will get my network connection back.
Sent from my Nexus S using Tapatalk

He is also using an i9020a
Sent from my Nexus S using Tapatalk

This is a screenshot of what happens. The mobile signal is consistent until I turn the screen on and the something happens.
Sent from my Nexus S using Tapatalk 2

why you're wifi on ?

I don't always turn it off when I go to work. Unless I'm traveling I usually leave it on.
Sent from my Xoom using xda premium

To begin proper troubleshooting turn wifi off while you browseand report back

I experience the same connectivity problems whether I have the wifi off or not.
Sent from my Xoom using xda premium

same problem bro
i am from the Philippines and i'm experiencing the same problem with my i9023. No connection when on "3G", connection resumes when "H" or "E" appears in status bar

I too have this problem it's annoying!!
Sent from my JB AOKP Nexus S

JellyBean WiFi signal

On ICS, in my room I get 3 bars when connected to WiFi and it never drops.
On any JB ROM, my phone sees the connection at 3 bars but when its connected its only 0-1 bar. 1 if I'm lucky. I'm sitting right next to my router and I'm getting only 3 bars.
I changed the WiFi region code to USA already and doesn't help at all.
Is there a radio I should flash or a modem? I'm on the latest firmware. 3.33 I believe. I'm on Bruce's cm10.
Is this a known problem?
Sent from my HTC Sensation using xda premium

if you are on tmous i believe wifi disconnecting\not connecting is a known issue as well as low signal on jellybean all around. U should consider urself lucky that you get any wifi connection I can't use jellybean roms because I need wifi and when I activate wifi it keeps losing signal then eventually causes my phone to reboot.

I don't get data at all on Cm roms so your doing pretty good with data and Wi-Fi.
I am however on a jelly bean rom that I received both good data and Wi-Fi. It's paranoid Android. I'm happy with that rom. It seems the others I can't get any data.best wishes
Sent from my HTC Sensation using xda premium

[Q] Cyanogenmod 9 Wifi Issue

First I want to say I am fairly new to this. I love this ROM! I am having an issue though, everything seems to work better than advertised accept the WiFi. The signal is weak and it will only work in 3g. I have the SGH-T959V the Galaxy S4G. I can connect to routers but it will not pick up 4G. I Flashed Heimdall one click GB then installed CM9. the wifi would connect at all so I trie a few other ROMs that were versions of CM9 but no luck. I went back to the orginal CM9 and the wifi would at least turn on! I was able to connect to a router at that point but still 3g only. Any help would be great!! I also tried to flash different modems but still the same.

There is no such thing as wifi 4g. Lol Either your are on wifi or you're not. 3g and 4g(h and h+ on cm based roms) are for the cell data network.

Lol, that is some mushroom trip.
Hit the thanks button if it helps. It's my motivator to be more helpful.

hechoen said:
There is no such thing as wifi 4g. Lol Either your are on wifi or you're not. 3g and 4g(h and h+ on cm based roms) are for the cell data network.
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Click to collapse
I'm thankful for the humour that the Q/A threads cause me.

Sorry for the confusion
hechoen said:
There is no such thing as wifi 4g. Lol Either your are on wifi or you're not. 3g and 4g(h and h+ on cm based roms) are for the cell data network.
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OK I agree sorry, my WiFi works but is weak and my cell network data is only coming in at 3g, It was at 4g before the Rom flash to CM9. Is there a reason it would not go back to 4G? Like I said it was fine before the flash.

Wifi has always been weak on our phones. The 3g/4g thing, the rom grabs 3g until it needs the data flow. Then, it would/should go to the 4g(h). Saves battery this way.
Sent from my SGH-T959V using xda app-developers app

champ1919 said:
Wifi has always been weak on our phones. The 3g/4g thing, the rom grabs 3g until it needs the data flow. Then, it would/should go to the 4g(h). Saves battery this way.
Sent from my SGH-T959V using xda app-developers app
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Click to collapse
Thanks for the reply, I do alot of streaming because I commute for work and it is not switching, I have not had it go to H yet, my stream has been choppy at best. I am thinking of wiping the phone and going back to GB stock then re flash CM9, I tested a few flashes before I landed at CM9 finally.

[Q] CM9 Data Network wont go to 4G

My phone was working fine after flashing it to GB Rom I was getting 4G data on it. After Flashing to CM9 I only get 3G, My BT works fine everything seems to work great the ROM is awesome I just cant get 4G any help would be great!

Check your modem in 'About Phone'. LB6 only shows 3G but you get 4G speeds. Other CM9 modems will show H instead of 4G.

Modem Version
lumin30 said:
Check your modem in 'About Phone'. LB6 only shows 3G but you get 4G speeds. Other CM9 modems will show H instead of 4G.
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I looked under About Phone and there is nothing that shows the modem version, I did try flashing several modems though. I never had one show "H"
always 3G, What modem would be best to run? I appreciate all your input, still learning!

Modem is baseband version.

It says T959VUVKJ6 Also says under status Mobile Network Type EDGE 2 is that correct?

Silly question here. You don't happen to have use 2g connection checked or anything silly like that. Data roaming and such also checked.?
Sent from my Nook Tablet using xda app-developers app

champ1919 said:
Silly question here. You don't happen to have use 2g connection checked or anything silly like that. Data roaming and such also checked.?
Sent from my Nook Tablet using xda app-developers app
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Not a silly question, I realized that the data connection for use only 2G networks was checked. I unchecked it and reset the data connection and there you go 4G. I appreciate all your help. I do have one more question. It seems every time my phone is rebooted the 2G connection sets by default automatically, can I stop that so I dont have to turn it off and reset the data connection every time?

kpeebler said:
Not a silly question, I realized that the data connection for use only 2G networks was checked. I unchecked it and reset the data connection and there you go 4G. I appreciate all your help. I do have one more question. It seems every time my phone is rebooted the 2G connection sets by default automatically, can I stop that so I dont have to turn it off and reset the data connection every time?
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I have the same situation and would like to hear how you resolve it. The check mark for 2 g keeps returning.
--Charley

Three major possibilities:
1) The ROM you're using might have it hardcoded. Change to a different ROM.
2) You might be using a battery saving program that sets it to save power. Remove the program or change its settings.
3) Something else.

Major Data problems

Hi all, I am having major data problems with my phone. I am using Ting on the sprint CDMA/LTE network.
I am currently running CM12.1 nightlies but the problem existed on Android stock L and CM 12.
What happens is, after 5 min to several hours i lose data connectivity and end up with an exclamation point on the signal bar meter. When this happens the only way to fix it is to reboot the phone. I have tried to do a Carrier update and PRL update but both give network errors and fail. I also tried to type the *#DATA code but it doesnt work, it just deletes what I type in an nothing happens.
Also, even when my data is working (and it says LTE on the signal bars), my mobile network data slider in settings is always off and can not be turned on, no matter what.
I am on the 5.1 radio and even tried to reflash it. Any ideas?
Thanks

mike240se said:
Hi all, I am having major data problems with my phone. I am using Ting on the sprint CDMA/LTE network.
I am currently running CM12.1 nightlies but the problem existed on Android stock L and CM 12.
What happens is, after 5 min to several hours i lose data connectivity and end up with an exclamation point on the signal bar meter. When this happens the only way to fix it is to reboot the phone. I have tried to do a Carrier update and PRL update but both give network errors and fail. I also tried to type the *#DATA code but it doesnt work, it just deletes what I type in an nothing happens.
Also, even when my data is working (and it says LTE on the signal bars), my mobile network data slider in settings is always off and can not be turned on, no matter what.
I am on the 5.1 radio and even tried to reflash it. Any ideas?
Thanks
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https://productforums.google.com/forum/#!msg/nexus/o-UyGECxh2k/VIK3PFfFwG8J

Also experiment with Radios. Nexus 5 for me has been the worst for Radio reliability. The latest one for me gives the issues you describe. Its not the only one to do so either.
Sent from my Nexus 5 using XDA Free mobile app

zagorteney said:
https://productforums.google.com/forum/#!msg/nexus/o-UyGECxh2k/VIK3PFfFwG8J
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THANKS! Insane the nexus 5 has such a major issue and it hasnt been fixed!

grim00 said:
Also experiment with Radios. Nexus 5 for me has been the worst for Radio reliability. The latest one for me gives the issues you describe. Its not the only one to do so either.
Sent from my Nexus 5 using XDA Free mobile app
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Do you mean try the 5.0 radio on 5.1?

Radio 2.0.50.2.21 works best for me.
Sent from my Nexus 5 using XDA Free mobile app