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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
Click to expand...
Click to collapse
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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Click to collapse
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

[Q] Nexus S 4G - DATA DROPS

I have been having this problem with both of my Nexus S 4G ever since I got them 2 months ago.
My data drops out frequently and takes a while to get back up. If I have 4G enabled, then I have to manually reconnect it as it will not do it on it's own. This happens inside AND outside. Driving down the road or just standing in one spot.
I've tried all of the radios (basebands) and about 7 different ROMs and versions.
I've refreshed the data profile, PRL, and even tried the roaming Verizon PRL and Hybrid PRL.
Gone back to stock and tried everything from scratch. Still the same problem.
Dallas/Fort Worth Area
Network: Sprint
Baseband: D720SPRKE1
PRL Version: P:40447
I contacted Sprint and they just told me to update the profile & PRL.....
Any suggestions?

I'm not familiar with the CDMA nexus s, but are you able to change APN's? At one point I'd be able to connect to 3g (I have an I9020A), but every minute or so it would drop, so I fixed up the APN's for my carrier.

iv had a few data issues
forcing PRL and account updates has fixed it a couple of times
i'v bought used phones that iv had
to have sprint force update
im on LC1
[altho i cant tell any significant difference here]
and my prl is 61086
[a business account]
im currently on slim
make sure your mobile network
is set to roam
is not set to home only

Am I the only one with this problem? As I'm typing this I lost data but still had 3 bars. I never drop calls but only data.
Help please. This is driving me nuts.
Sent from my Nexus S 4G using xda premium

andrewddickey said:
Am I the only one with this problem?
Click to expand...
Click to collapse
no
i go thru periods of it acting bizarre
try disabling wifi and reboot
this USUALLY fixes mine till wifi is re-enabled
and i drop the sprint connection a few times
riding around
it then fails to re-acquire the IP address.
look in your status and see if you still have an IP
when your data fails
fwiw

I never use Wi-Fi. Ever.
Happens while using both 3G and 4G.
Sent from my Nexus S 4G using xda premium

4G is worthless here...
i dont even bother with the switch
does it do the same thing if you disable 4G?

I almost always have to use 4G (if possible) since 3G speeds are slower than dial-up.
I've tried rebooting and leaving 4G off, and still the same. Even tried going back to Gingerbread.
Sent from my Nexus S 4G using xda premium

andrewddickey said:
I almost always have to use 4G (if possible) since 3G speeds are slower than dial-up.
I've tried rebooting and leaving 4G off, and still the same. Even tried going back to Gingerbread.
Sent from my Nexus S 4G using xda premium
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Click to collapse
If going back to GB doesnt help, maybe it is hardware related?
---===:::Greetzz, jojoost:::===---
Sent from my iPad using Tapatalk HD

This is happening with BOTH of my NS4G.
Possibility that BOTH have hardware defects?

Do a profile and prl update
Hit the thanks button if i helped

R0M CHEF said:
Do a profile and prl update
Hit the thanks button if i helped
Click to expand...
Click to collapse
In the original post, I stated that was one of the things I've done.

have you checked to see if you have an IP address
when data fails?
mine shows "unavailable" when it's wonky
and wont re-aquire till i reboot.
i'v seen this on 2 phones
off and on including on oem 2.3.7
fwiw

andrewddickey said:
Am I the only one with this problem?
Click to expand...
Click to collapse
I have the same problems. From what I understand, its a problem with the hardware. I can confirm that's probably the case, because I've tried many different ROMs (stock, cm, etc...) and they all have the same radio issues (3g/4g and wifi)...

I have an NS4G in the DFW area and haven't seen the issues you're reporting. I'm currently on 4.0.4 with D720SPRLC1 baseband. Maybe I'm just lucky and have a good signal at work and home. It's very rare that I find an area of DFW where I don't get any data signal at all. Not sure what to suggest.

I get random drops too and i hate it. My 3g speeds are fairly good even above 1 mbps. Highest i ever got on 3g was 1.51 mbps

Mine will lose data if I'm in a coverage free area for an extended period of time, when I'm back in range 3g icon will show up just never reconnect. A reboot fixes it

Certain Areas
There are certain areas where I live that data just disappears. Although this is just a network thing I believe. It's weird though when I am driving it's like a 10 second drop and then all is good. Hope you get a solid fix!:victory:

Backup 4g Partition
REMOVED - was a bad idea.

I've actually replaced BOTH of the phones with brand new NS4Gs and they shipped with ICS.
Still the same problem.
This is driving me nuts. I was driving and trying to download Maps for the new phone from the Play Store and it took 6 tries. Kept saying RETRY.
What I've come to believe is happening is:
When 4G connects, 3G disconnects. When 4G drops (which is does frequently), 3G has to reconnect.
***Is there a way to keep 3G "on" in the background while 4G is connected?*** Maybe a way for the radio to transition back and forth?

Repeatedly Losing Data Connectivity

My Nexus 5 frequently loses mobile data connectivity. Its been happening since I purchased it, but the frequency with which it happens has increased since I flashed the M1 snapshot of CM. I've since flashed the second snapshot from early January, but it has not made any difference.
This is the same sim card that ive used with my nexus 4 and my htc one without any problems, and I've made no changes in my wireless carrier.
Does anyone have any thoughts as to why this happens?

Try a different,maybe older, radio. If that doesn't help go back to stock and see if it persists.
sent from my Hammerhead Nexus

Flash the Nexus factory image. If that fixes it, its a problem on CM's side
Sent from my Nexus 5 using XDA Premium 4 mobile app

hi.
i was this problem too, not exaactly the same, but somehow similar. I have 3g connection, the signal bar shows H and somtimes 3G, but the speed is freaking slow, worse than 2g. Initially I thought its something wrong with my phone, been changing ROMS to see if it is the issue, but no. Then I flash the latest baseband / radio, and still doesnt help.
Be reminded I am on 4G plan, but never had any 4g network ( it is not because i'm not in an area with no 4g network )
I was very frustrated and emo at the same time, thinking of RMA the phone, thought it is the radio chip problem.
but then... I called my telco, asking why I'm experiencing slow connection and bla bla, and I don't have 4g network. They keep saying my network is working perfectly, and running normally, I requested them to reset my network connection. They agreed and asked me to turn off the phone for a few minutes then they reset the network for me.
After that, everything is running perfectly.
This was 2 days ago. And guess what, I don't have any 4g connections now again. Stupid telco, I'm going to call them later when i'm free. grrr.
but please make a call to your telco and ask them.
Hope that helps

No data in Carbon ROM.

I spent an hour on the phone with AT&T and couldn't resolve the issue of why I don't have data working.
Can anyone help me to figure out why I can't get data with this ROM?
Sent from my SGH-T699 using XDA Free mobile app

Being this phone has T-Mobile radio bands the first you need to do is unlock it, which if you have the ability to make phone calls I assume you did this or someone did for you
Also you will need proper APN set up, this should have been something you tried spending an hour on the phone with ATT. So that leads me to believe that there is an alternative APN setup that you need, just do a Google search and you will probably find a couple setups out there and try them all
Do note that you probably will get lower data speeds being this phone isn't working with the bands that ATT uses - but I'm a T-Mobile user so haven't specifically tried to get mine to work thus have no experience to help further
Sent from my Nexus 4 using XDA Premium 4 mobile app

demkantor said:
Being this phone has T-Mobile radio bands the first you need to do is unlock it, which if you have the ability to make phone calls I assume you did this or someone did for you
Also you will need proper APN set up, this should have been something you tried spending an hour on the phone with ATT. So that leads me to believe that there is an alternative APN setup that you need, just do a Google search and you will probably find a couple setups out there and try them all
Do note that you probably will get lower data speeds being this phone isn't working with the bands that ATT uses - but I'm a T-Mobile user so haven't specifically tried to get mine to work thus have no experience to help further
Sent from my Nexus 4 using XDA Premium 4 mobile app
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Click to collapse
I forgot to mention that data was working fine with the stock ROM, both the one the phone came with and the OTA upgrade version.

I just installed CM 11 snapshot M8, and have the same issue of no data. Prior to installing (through TWRP 2.7.1.0), I did a factory reset, then wiped Dalvik Cache, System, Cache, and Data.
Why would would the stock ROM work but not these others?

Did you go into settings and change the APN in cm11 yet?
Sent from my Nexus 4 using XDA Premium 4 mobile app

demkantor said:
Did you go into settings and change the APN in cm11 yet?
Sent from my Nexus 4 using XDA Premium 4 mobile app
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Click to collapse
That did it! I had to select ATT Phone. For whatever reason, ATT LTE doesn't seem compatible. I live in the hills, so have inconsistent coverage, but the indicator goes from 3G, to H, to H+, then back again, based on... wind, clouds, barometric pressure, or whatever the usual issues are. Anyway, I've been with AT&T since 05 and the only time I actually saw a noticeable increase in real-world speed was going from an EDGE device to a 3G device. 4G doesn't seem to be any faster, which I believe is due to backhaul issues, not connection speed of my phone to a tower.

Terrible network connectivity since official Lollipop update.

Since fishing the factory images last week I have been experiencing a virtually nonexistent mobile network connection with my N5 on T-Mobile, basically 90% without connection where I used to get perfect reception. I've tried flashing the old radio, re-flashing Lollipop radio, factory reset, etc. Nothing helps. Is it just me or is anyone else experiencing this?
Sent from my Nexus 5 using XDA Free mobile app

Did you do a full wipe? Reflash factory image?

I've done everything short of completely rehashing the factory images. Just factory reset the device an hour ago.
Sent from my Nexus 5 using XDA Free mobile app

I'm on PTEL (part of Tmobile network). My cell data went to zero after I upgraded. Haven't left the house yet to see if it kicks in elsewhere, but looks like it's just not receiving it (since I use to get at least 2 bars).

Well, turns out it was a loose connection related to a recent screen replacement. Problem is solved, Lollipop not the issue. Kill the thread, dad.
Sent from my Nexus 5 using XDA Free mobile app

Eh i was just gonna say that i have same problem it looks like mostly t mobile or t mobile engaged users are affected!
Im from europe, and i cant get LTE any more im loosing siglan periodically, only 3g preferred works. Really anoying.. Flashed factory image stock,non rooted, unlocked bootloader only if someone find workaround or have advice..yes please
Sent from my Nexus 5