Develop Bugs

One X on AT&T H to 3G to H... rinse and repeat!

Guys,
Unlocked and rooted One X on AT&T and my pegged out signal keeps changing from H to 3G over and over and over.... you get the picture. Never stays on one very long before changing and will disrupt data services for a brief moment while it does.
Is anyone else seeing this behavior and if so, any fix to resolve?
SG

swich2mac said:
Guys,
Unlocked and rooted One X on AT&T and my pegged out signal keeps changing from H to 3G over and over and over.... you get the picture. Never stays on one very long before changing and will disrupt data services for a brief moment while it does.
Is anyone else seeing this behavior and if so, any fix to resolve?
SG
Click to expand...
Click to collapse
Yea I notice it. I believe it's part of the way it saves power but idk if thats true because on my Galaxy Nexus, it would almost always stay on "H".
Mine doesn't really switch out of "H" though when actually loading something, just takes a bit to go from "3G" to "H". I've maybe experienced it once or twice when actually loading something where it would switch out of "H" to "3G" while loading something on XDA or a website. But it's usually when connection is weak.

I'm having the same issue.

if it keeps happening, then complain to ATT and ask for credit on your data plan because it doesn't work the way it should.

From what I read, AT&T phones show only h, even though in the background they switch back and forth.
But when you use international phones on the network, it will show the switching around. I'm not sure if that's related to your issue, but over here on rogers, my phone switches between 3g and h constantly, even when I'm at one location.. The thing is that I don't get long disruptions though, if any at all.

I'm on att and don't experience this. My icon switches frequently but I don't see any interruption in service.
Sent from my Xoom using xda premium

Thanks all, just wanted to make sure that I was the only one experiencing. I will probably go into the AT&T store and see if their One XL display units is doing the same thing while I have mine with me.
Could be that "international" issue type of thing... who knows.

Yes, mine does this too. Im on straight talk which uses at&t and it frequently keeps switching back and forth.
Sent from my HTC One X using Tapatalk 2

Mine should be in on Tuesday. Think we might have the wrong APN's??

Have you checked the APN settings?
http://forum.xda-developers.com/showthread.php?t=1109983

Moving from 2/3G to HSPA+ is by design and called fast dormancy. Here's more than you could ever possibly want to know about it.
http://www.slideshare.net/zahidtg/gsma-fast-dormancy-best-practices
It saves battery life and when working properly it's undetectable. That is when FD is active on a device and the network it's using supports it. (AT&T does). If OP's dropping signal something's wrong. I'd check...
- The APN's you use on AT&T must match the plan that's provisioned in your account settings. If you're on a 3G plan (grandfathered unlimited, MediaNet, data for non-Smartphones) use the 3G (Cingular) settings. If you're on a 4G (non-LTE) plan use the 4G (HSPA+) APN. Wrong APN means funky data even if it seems fine sometimes.
- Older SIMs or SIMs from iPhone's in non-Apple devices have caused problems. As has bad surgery in the move to micro. Pop in to an AT&T store and get a new micro SIM matched to the provisioning of your account.
- Bad phone h/w. In not the above it could be the device.
I've just been across the country on the AT&T network and my phone has performed better than my i9100 in picking up and maintaining a signal (I'm on a 3G plan). It's been impressive actually especially in moving from HSPA to Wi-Fi and back. So with the right settings the phone itself should be fine.

vinuneuro said:
Have you checked the APN settings?
http://forum.xda-developers.com/showthread.php?t=1109983
Click to expand...
Click to collapse
Just tried that and it's not working for me. Doubled checked, everything is exactly as he said. I just don't have the option to switch from what it currently is (MediaNet). There's no radio button for the other two. Even after deleting the original (only leaving the two I just made) and restarting, I have no connection to the network.

angingrich said:
Just tried that and it's not working for me. Doubled checked, everything is exactly as he said. I just don't have the option to switch from what it currently is (MediaNet). There's no radio button for the other two. Even after deleting the original (only leaving the two I just made) and restarting, I have no connection to the network.
Click to expand...
Click to collapse
I agree, the settings aren't working for me either in Orange County, CA

After you set up the new APN's try deleting the old one. You can always get it back by selecting "restore to default."

BarryH_GEG said:
After you set up the new APN's try deleting the old one. You can always get it back by selecting "restore to default."
Click to expand...
Click to collapse
has it worked for you?

meihcydna said:
has it worked for you?
Click to expand...
Click to collapse
I had an unactivated micro SIM that I had my corporate account rep activate so my situation's different than yours; the SIM is tied exactly to the settings in my account. I popped it in, it picked up the MediaNet settings, and all was good.
My phone has a single APN so I can't see the way the settings look when there are multiples. The last setting in the active APN is "APN enable/disable" which is greyed out on my because there's no other choice. Did you try disabling it after you got the new APN's entered? Maybe if you do it'll allow you to select the new APN's you created.

BarryH_GEG said:
I had an unactivated micro SIM that I had my corporate account rep activate so my situation's different than yours; the SIM is tied exactly to the settings in my account. I popped it in, it picked up the MediaNet settings, and all was good.
My phone has a single APN so I can't see the way the settings look when there are multiples. The last setting in the active APN is "APN enable/disable" which is greyed out on my because there's no other choice. Did you try disabling it after you got the new APN's entered? Maybe if you do it'll allow you to select the new APN's you created.
Click to expand...
Click to collapse
My "APN enable/disable" is greyed out as well. I tried the new APNs in the other thread and couldn't get a internet connection. The only successful APN with the One X was the medianet. Other than that, I'll settle for the medianet but only wanted to change it to get better speeds in my area since this phone is capable of receiving up to 21mbps.

meihcydna said:
this phone is capable of receiving up to 21mbps.
Click to expand...
Click to collapse
The highest I've seen on either an international phone or an AT&T 21MB-capable phone is 8MBish down. That's in TX where there's lots of bandwidth shared by not a lot of people. In markets like LAX, NYC, and SFO you're lucky to break 5MB because of the congestion. I've seen 2MB and under in Manhatten. HSPA+ speeds on AT&T are very much YMMV.

BarryH_GEG said:
The highest I've seen on either an international phone or an AT&T 21MB-capable phone is 8MBish down. That's in TX where there's lots of bandwidth shared by not a lot of people. In markets like LAX, NYC, and SFO you're lucky to break 5MB because of the congestion. I've seen 2MB and under in Manhatten. HSPA+ speeds on AT&T are very much YMMV.
Click to expand...
Click to collapse
I agree but just thought I could push a bit more since I'm only hitting 6mbps. Thanks for the info though!

Just whats on my phone
Ok so I was looking at my piece of craptivate and its APN settings. Mine are quite different from what you guys are saying. Should I change this if I try to cut down my current sim?? Here are settings on current sim.
Name cingular 410
Apn wap.cingular
proxy not set
Port Not set
Username [email protected]
Password ******** (does this mean it has a password??)
Server cingualrgprs.com
MMSC mmsc.cingular.com
MMS Port Not set
MCC 310
MNC 410
Authentication type not set
APN type default,supl,mms
Apn Protcol ipv4

[Q] Phone won't roam-settings are missing

Hello everyone,
I have a new AT&T plan with five lines, all using Samsung Galaxy S3s, all having the same problem. My 14 day grace period to cancel is almost up and I'm at my wits end searching for an answer. The phones are not rooted as I do not understand most of this technology; however I'm smart enough to know that this is a problem beyond rebooting the phone or resetting the SIM card, as every forum out there is telling people to do. Calling tech support (please don't make me) is a LAST resort for any device I own.
In the town where I work and shop I have no signal at all from AT&T. No voice, text, or data. AT&T coverage map shows "good" coverage in this town. Every so often I do get a weak AT&T signal but only for a few seconds. I do however pick up a very strong signal from a T-Mobile tower. I know that AT&T and T-Mobile both use GSM and should be compatible for roaming purposes, but the phone does not roam; it just shows a strong signal that I cannot connect to. Also, it switches back and forth between these two towers. I posted screen shots taken one minute apart.
In my phone's "Mobile Networks" settings there is no option to chose a network. There are only four options on that page: Mobile Data (checked), Data Roaming (not checked), APN, and Network Operators. I have tried adding a new APN but that did not work. The Network Operators tab says "Default Setup" and I cannot change it. I understand this is an issue with AT&T - they deliberately remove these settings.
I have gone through all the settings in Service Mode using *#197328640# looking for a way to enable the missing settings. I have already used the Service Mode to disable LTE (another setting AT&T likes to deprive us of) but that was not the problem so I put that back on automatic. I have also checked and unchecked every imaginable combo of settings such as wifi, data, airplane mode, etc.
I think the problem is either that the T-Mobile tower is interfering with what *should* be a good AT&T signal, or that the fact that I am "connected" to AT&T (albeit with no bars) is preventing me from roaming. I'd like to know if there is a way to disconnect from AT&T to test that theory. Also, I'd like to know if there is something I can do from Service Mode to enable the missing settings so I can set up roaming.
Thanks so much for any suggestions or help.
Kelly

What APN(s) are currently listed?

xBeerdroiDx said:
What APN(s) are currently listed?
Click to expand...
Click to collapse
Just the default one called "ATT Phone".
I tried a Cingular APN in order to get a better connection to the AT&T tower, but it didn't work and I removed it. I found the T-Mobile APN info and was planning to try that next time I'm in town if I don't find some other solution first.

Is it the wap.cingular or pta one? You have to reboot after changing apn's but I'm sure you already knew that

xBeerdroiDx said:
Is it the wap.cingular or pta one? You have to reboot after changing apn's but I'm sure you already knew that
Click to expand...
Click to collapse
I used the wap.cingular one and did reboot. Do you think this is an APN issue? I'm kind of at a dead end unless I find where to enable those mobile network settings. Thanks for your responses.

kelmusc said:
I used the wap.cingular one and did reboot. Do you think this is an APN issue? I'm kind of at a dead end unless I find where to enable those mobile network settings. Thanks for your responses.
Click to expand...
Click to collapse
If you do not have the pta apn, try and add it. That's the LTE network.
Name: ATT PTA
APN: pta
MMSC: http://mmsc.mobile.att.net
MMS Proxy: proxy.mobile.att.net
MMS port: 80
MCC: 310
MNC: 410
Auth: none
APN type: default,mms,supl,hipri
Add this in, select it and reboot

I have added it and will get to town tonight to see if it works. I'll post an update afterward. Thank you!

kelmusc said:
I have added it and will get to town tonight to see if it works. I'll post an update afterward. Thank you!
Click to expand...
Click to collapse
Yeah, let me know how that worked. Remember to reboot afterswapping apns. Just sayin'

xBeerdroiDx said:
Yeah, let me know how that worked. Remember to reboot afterswapping apns. Just sayin'
Click to expand...
Click to collapse
Unfortunately, it didn't work. I also tried to use a T-Mobile one and the phone wouldn't even let me save it.
I broke down and called AT&T tech support to find out where the roaming settings are in the phone... of course they didn't tell me, but they did tell me they don't have a roaming partnership with T-Mobile in my area. Therefore I'm out of luck and will be cancelling my contract.

kelmusc said:
Unfortunately, it didn't work. I also tried to use a T-Mobile one and the phone wouldn't even let me save it.
I broke down and called AT&T tech support to find out where the roaming settings are in the phone... of course they didn't tell me, but they did tell me they don't have a roaming partnership with T-Mobile in my area. Therefore I'm out of luck and will be cancelling my contract.
Click to expand...
Click to collapse
Sorry buddy. Best of luck. Use your s3 on a carrier's no-contract plan. Perhaps t mobile or straight talk? Cheers

[Q] IPv4 not working in AOSP roms

Im wondering why in aosp, why the apn setting using ipv4 T-Mobile US LTE......kills my data connection but T-Mobile US LTE IPv6 works.
Anything i can do on my end?
Kernel, rom related?

I'm not sure why this works (especially seeing both names resolve to the same two IP addresses) but I've found I can always get the IPv4 APN to work if I go in and edit the APN to fast.tmobile.com from fast.t-mobile.com.
Tethering still gives me problems when IPv6 is available so I am glad changing the APN destination works, even if I still can't explain it.

Weird....that did work. I'm actually getting faster download speeds under ipv4 compared to ipv6 lol

Here's another question, why can't I send or receive MMS on AOSP while on Wifi??

Cellular Data problem

At the beach today and was getting 3g to 4g showing on my phone (stock not rooted). Mail, chrome, maps and other programs were not connecting. I set up my tether to my tablet and it was able to use the data to connect with things just fine. Normally I have no problem with cell data. I assume the signal was not as strong as usual at the beach but it did show 4g and 3g and I would have thought if my tablet was able to receive the tether and load data fine the phone should have.
Anyone have any thoughts on this?

GTT1 said:
At the beach today and was getting 3g to 4g showing on my phone (stock not rooted). Mail, chrome, maps and other programs were not connecting. I set up my tether to my tablet and it was able to use the data to connect with things just fine. Normally I have no problem with cell data. I assume the signal was not as strong as usual at the beach but it did show 4g and 3g and I would have thought if my tablet was able to receive the tether and load data fine the phone should have.
Anyone have any thoughts on this?
Click to expand...
Click to collapse
APN settings alroght?

ZenFoneFan said:
APN settings alroght?
Click to expand...
Click to collapse
I think they look okay. I am on T-Mobile and under apn I have T-mobile US LTE fast t-mobile.com

Brand New unrooted/stock on AT&T
ZenFoneFan said:
APN settings alroght?
Click to expand...
Click to collapse
I am having similar problems on my new zenphone2
AT&T Network, settings as follows:
per AT&T's documentation:
access point name: ATT Phone
APN: phone
proxy/port/username/password/server: not set
MMS port: 80
MCC port: 310
MNC port: 410
authententication type: Not set
APN Type: default,mms,supl,hipri
APN protocol : IPv4
APM roaming protocol: IPV4/IPV6
APM enable/disable: APN enabled
Bearer: Unspecified
MNVO type: NONE
MNVO value: not set
Now if I go into about/status, I see
Cell network type hspa (ugg...) Signal strength 83db
service state: voice: in service/Data in service
Roaming: Not roaming
Cellular network state: Disconnected:
Now if I were a betting man, I'd say the VERY last line is my problem.
But HOW the FRECK do you get it on?
hate calling the tech support (jerk support line?) (I can say that as I did it for a number of years!)
oh oh, just re boooted phone, and now cell network state says :CONNECTING..
This could be good, but will keep here as a answer to others, I hope!!!
Nope, went from Connecting to DISCONNECTED again
So original question persists!
(wifi on, phone fine, wifi off, no data...ie, cell data not working)
OK. so far , update from original post.
************it Seems that despite my telling the associate at the AT&T store I had a grandfathered, unlimited data plan.
AND that yesterday's chat with billing), My plan was re-configured to be a "no data plan, pay as you go" device *****
The nice person at the tech support hotline escalated the problem to tier 2, and also gave me a TICKET #. (YES, you ALWAYS need a ticket number at ANY carrier when you have problems like this!)
She also gave me a 3gb plan for today/tomorrow, and told me that tier 2 would be able to re-establish my grandfathered plan.
I also told her that this happened WITHOUT MY CONSENT, WITHOUT MY SIGNATURE, and that this could become an FCC complaint (they HATE those!) as well as the automatic termination of my 2 year contract from my side.
SO, we will see, and I will update later in the week.
but I currently have data now, that 'connecting... was the key message'

note 5 IPv6 supported (on at&t)

This note 5 is the first phone I have with AT&T that's getting a non-local (2600::380::....) IPv6 address from the cell tower. I wasn't getting ipv6 on my nexus 6 last week (same LTE network.)
Does anyone know if this was something that AT&T recently enabled, or if they are only doing router announcements to specific APN's and/or h/w?

garyd9 said:
This note 5 is the first phone I have with AT&T that's getting a non-local (2600::380::....) IPv6 address from the cell tower. I wasn't getting ipv6 on my nexus 6 last week (same LTE network.)
Does anyone know if this was something that AT&T recently enabled, or if they are only doing router announcements to specific APN's and/or h/w?
Click to expand...
Click to collapse
From what I have read AT&T has started their plans for IPv6 since 2012 and started roughly mid 2014 rolling them out on the cellular network. They state the roll out will be slow, so it is possible they just turned it on by you. Is it possible also that it was not enabled on the Nexus 6 by default?

KennyG123 said:
Is it possible also that it was not enabled on the Nexus 6 by default?
Click to expand...
Click to collapse
It's possible, but I'd think it would have to be on the carrier side if that was the case. With the nexus device, I was using the same firmware that everyone in Europe (and most of Asia) is using - and many of them were getting ipv6 numbers.
As well, my home wifi network (ipv6 dual stack) would result in an ipv6 address assigned to the handset.
Actually, to be more accurate, they were getting RA's. Android doesn't do DHCPv6 at all.
It's quite possible that AT&T just got around to turning it on in my area at the same time I switched phones, but that'd be an interesting coincidence. The more I think about this, the more I'm convinced it was related to the APN. I'm unable to check now, but I'm starting to wonder if the default APN for the nexus6 on AT&T blocks ipv6.

garyd9 said:
It's possible, but I'd think it would have to be on the carrier side if that was the case. With the nexus device, I was using the same firmware that everyone in Europe (and most of Asia) is using - and many of them were getting ipv6 numbers.
As well, my home wifi network (ipv6 dual stack) would result in an ipv6 address assigned to the handset.
Actually, to be more accurate, they were getting RA's. Android doesn't do DHCPv6 at all.
It's quite possible that AT&T just got around to turning it on in my area at the same time I switched phones, but that'd be an interesting coincidence. The more I think about this, the more I'm convinced it was related to the APN. I'm unable to check now, but I'm starting to wonder if the default APN for the nexus6 on AT&T blocks ipv6.
Click to expand...
Click to collapse
This guy states his was set for IPv4 by default instead of the normal ipv4/ipv6 setting.

Where are you seeing ipv6? In system settings >about device>status ? That looks like ipv4/ipv6 from your phone to att's internal network.
I did check ip6.me and that showed an ipv6 address, but couldn't be sure that was legit. ..

quordandis said:
Where are you seeing ipv6? In system settings >about device>status ? That looks like ipv4/ipv6 from your phone to att's internal network.
I did check ip6.me and that showed an ipv6 address, but couldn't be sure that was legit. ..
Click to expand...
Click to collapse
I'm using a third party program to check the IP addresses (one that specifically shows IPv6.) The same IP shows under settings->about->status.
The 2600:: address it's showing is a legit global IPv6 assignment, and android ONLY does SLAAC (not DHCPv6) so it must be seeing an ipv6 RA.
On the other hand, I can't ping it from the outside, so it appears that AT&T has some proxy between the phones and the "rest of the world." What I don't understand is why they'd be assigning proper global IPv6 addresses behind a proxy unless it's a stage in a larger rollout. (If they intended to keep things behind the proxy, they should be using fc00::/7 range addressing - or addresses starting with FD.)
For YOU, what ipv6 address are you seeing when wifi is turned off? If it starts with "260", it's part of AT&T's global block.

garyd9 said:
I'm using a third party program to check the IP addresses (one that specifically shows IPv6.) The same IP shows under settings->about->status.
The 2600:: address it's showing is a legit global IPv6 assignment, and android ONLY does SLAAC (not DHCPv6) so it must be seeing an ipv6 RA.
On the other hand, I can't ping it from the outside, so it appears that AT&T has some proxy between the phones and the "rest of the world." What I don't understand is why they'd be assigning proper global IPv6 addresses behind a proxy unless it's a stage in a larger rollout. (If they intended to keep things behind the proxy, they should be using fc00::/7 range addressing - or addresses starting with FD.)
For YOU, what ipv6 address are you seeing when wifi is turned off? If it starts with "260", it's part of AT&T's global block.
Click to expand...
Click to collapse
Yep, when not on WiFi, and just on data, IPv6 block starts with 2600. Interestingly, my IPv4 address starts 10.102 - so guessing that's internal IP. Not at all surprised that 2600 block is not accessible from "outside". That said, I'd be curious to see if two phones on the same ATT switch would be able to communicate with each other over the internal network? My inclination is that it's not at all possible, but...who knows?

quordandis said:
Yep, when not on WiFi, and just on data, IPv6 block starts with 2600. Interestingly, my IPv4 address starts 10.102 - so guessing that's internal IP. Not at all surprised that 2600 block is not accessible from "outside". That said, I'd be curious to see if two phones on the same ATT switch would be able to communicate with each other over the internal network? My inclination is that it's not at all possible, but...who knows?
Click to expand...
Click to collapse
I have a broadband modem (LTE) on my work machine, and when I connect to AT&T with that, i do NOT get an ipv6 address. Then again, it's using the older LTE apn of "broadband"