Develop Bugs

Signal Fluctuation

Is there a fix out there yet to maintain the hspa signal and not go from 3G to H I think this really has a lot to do with whatever battery drain is experienced. This was the same issue with the Galaxy S2.
Sent from my Galaxy Nexus using xda premium

There is no "fix" needed because it's the intended behaviour and has been for a long time in Android. It should not cause any battery drain but in fact save battery life since it will drop down to UMTS from HSPA when it's idle.
If it does cause issues it's because of a bad radio or RIL implementation, not the behaviour of Android itself. It works fine on most phones.
And no, from what I remember the issue in the GS2 was with one of the modes themselves, not the switching.

blunden said:
There is no "fix" needed because it's the intended behaviour and has been for a long time in Android. It should not cause any battery drain but in fact save battery life since it will drop down to UMTS from HSPA when it's idle.
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I was under the impression that was a feature of CyanogenMod Heard Steve mention it himself!

Source on that Cyanogen fix?

jimpjr said:
Is there a fix out there yet to maintain the hspa signal and not go from 3G to H I think this really has a lot to do with whatever battery drain is experienced. This was the same issue with the Galaxy S2.
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This is not an "issue".
This is the intended way that the phone should interface with the network. You will be on UMTS when the phone is idle, and switch quickly to HSPA when you need to pull down/push up lots of data. When the transfer is done, you go back to UMTS.
This is actually one of the great features about GSM/HSPA+. It saves your battery when you're just idling syncing and getting push e-mail (using UMTS), but still offers great speeds when you need them (using HSPA+).
On some phones with skins or carrier firmware, their "H+" or "4G" icons stay up in the status bar, even when the phone is actually on UMTS. If you go into the "about phone" screen and watch the network, it will switch back and forth between HSDPA and UMTS. This is probably leading to some confusion.

KiNG OMaR said:
I was under the impression that was a feature of CyanogenMod Heard Steve mention it himself!
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No, it's not. What you may be thinking of is that CM turned on the setting to differentiate UMTS from HSPA (3G icon vs. H icon) that existed in AOSP but was rarely turned on by the manufacturer. That's all he was referring to.
watso4183 said:
Source on that Cyanogen fix?
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There is none. See above.

lte preferred network not working?

I live in Dallas tax and according to the coverage map lte is all over. When my preferred network settings are set to lte/ cdma it never connects to lte goes to 3g for a few minutes then disxonnexts. Switch my preferred network settings to cdma and 3g is always connected. Could this be a cyanogen issue or do most people deal with this? Any help would be appreciated.
Thanks

Sprint's marketing department figured it'd be better to show LTE coverage of completion. Unfortunately, your area is probably not covered yet, but will be once the city is completely upgraded.

So basically I need to leave it in CDMA preferred network mode to keep it connected?

ws669 said:
So basically I need to leave it in CDMA preferred network mode to keep it connected?
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LTE coverage would be a Sprint problem - the random disconnects are timeouts through eHRPD via Cyanogenmod RIL issues. It wont timeout on you on other ROMs, but if you place it onto CDMA only, you'll be fine.
Until Cyanogenmod fixes the problem, the random LoS (Loss of Service) issues will continue.

If you download and use Sensorly, it shows actual coverage, where actual users have picked up LTE coverage.

Anybody know of good ROMs that don't have this issue? My friend said aokp is good but he's on a different carrier, any thoughts?
Thanks

I was using AOKP and was having this same issue... assuming it's because they get a lot of their code from the CM repos.
I ended up trying out a few different TW ROMs and my signal strength was amazing with any of them. Currently I'm using FreeGS3 ( http://forum.xda-developers.com/showthread.php?t=1748818 ) and have no real issues.
The only thing that bugged me about the TW ROMs is some of the default apps like Email/Exchange, but I just replaced those with the APKs from AOKP and everything is fine.
If the signal issue gets fixed in CM/AOKP I would be more than willing to jump back, but the massive difference in signal strength is too much for me to not use a TW ROM.

ws669 said:
Anybody know of good ROMs that don't have this issue? My friend said aokp is good but he's on a different carrier, any thoughts?
Thanks
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All AOSP roms are based off CM10 github, so they're all going to have the issue. AOKP is a little dated now 11/10 build doesn't have LoS, but it doesn't connected to Ehrpd either. The issue is, once LTE connection is established, and you move outside an LTE area, you go LoS for a bit (some say 20 seconds, others say 5 minutes). But it wont lose signal until LTE is dropped.
EDIT: the cm10 timeouts were after the LJ7 blobs were implemented, which I believe were 11/11 and after.

This is also happening on stock jb.
Sent from my SPH-L710 using xda app-developers app

thanks for the info, going to flash the tm rom when I get home.

Im in Dallas as well and its still being built out.
I get 3G at home, closer to down town. I get stable and steady 4G LTE at work, near Abrams and NorthWest HWY. In fact at my office on the 4th floor im on 4G LTE all day, ride the elevator down and by the time i get to my truck in the parking lot back to 3G. Drive a minute down the road and it might go back to 4GLTE again.
Luckily for me at my office on the 4th floor i get 4G LTE strong enough it holds the signal and isnt constantly switching.
The odd thing is a couple times a week my phone will switch to 4G LTE at my residence but when this happens i get no data on my device. I have to wait for it to go back to 3G to get data back. I think its a tower issue.

I'm having the same experience. LTE usuallys drops quickly. I get it in my apt and it is pretty fast. I live in Richardson. I experience LOS when I try to go from 4g to 3g. It drops the call everytime.

Well damn, hopefully they hurry and build out the network around dallas

ws669 said:
Well damn, hopefully they hurry and build out the network around dallas
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I think thats the sentiments of everybody on Sprint with an LTE device.. No matter where they are..

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AOSP LTE

How come LTE doesn't work on AOSP as it does on TW. I'm in Virginia Beach and it's very usable on TW but can't pick it up on AOSP. Also I'm on CM10.1 M2. Is there anything I can do to make this better?
Aaron Swartz, Rest in Pixels.

LTE works fine for me on AOSP roms, it's not as strong as a TW rom but it definitely works.

Lancerz said:
LTE works fine for me on AOSP roms, it's not as strong as a TW rom but it definitely works.
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That's not necessarily true. TW's signal bars depict 1X / Voice, but not data properly. AOSP on the other hand depicts data strength always.
On a side note, people actually use TW? Good grief.

NYCHitman1 said:
That's not necessarily true. TW's signal bars depict 1X / Voice, but not data properly. AOSP on the other hand depicts data strength always.
On a side note, people actually use TW? Good grief.
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To an extent. Cm10.1 actually displays voice signal, even when an established 3g connection is active. Though it does display 4G connectivity via signal bars.

Anything I could do to get it working? Like it works, it just can't pick it up. When it does, it's just for a second and there's no bars when it does.
Aaron Swartz, Rest in Pixels.

jamcar said:
Anything I could do to get it working? Like it works, it just can't pick it up. When it does, it's just for a second and there's no bars when it does.
Aaron Swartz, Rest in Pixels.
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LTE never worked as well on AOSP ROMs for me and a few other people since the switch from 4.1 to 4.2. Sounds like there is nothing you can really do about it because you are in a weak signal area for LTE.

Fire Ball said:
LTE never worked as well on AOSP ROMs for me and a few other people since the switch from 4.1 to 4.2. Sounds like there is nothing you can really do about it because you are in a weak signal area for LTE.
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I thought I had weak signal, but, I have a stronger LTE signal than 3G, on TW. I was getting -73dBm on LTE:14, again on TW.

jamcar said:
I thought I had weak signal, but, I have a stronger LTE signal than 3G, on TW. I was getting -73dBm on LTE:14, again on TW.
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Are you checking this in status under about device? Or are you using an app like SignalCheck?

Fire Ball said:
Are you checking this in status under about device? Or are you using an app like SignalCheck?
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Used both and had minor changes, like maybe two or three numbers different ( so like one said -73 and the other said -75)

jamcar said:
Used both and had minor changes, like maybe two or three numbers different ( so like one said -73 and the other said -75)
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Ok because TW will only show 1X strength even under status. Can you show me a screenshot of your values in SignalCheck?

Fire Ball said:
Ok because TW will only show 1X strength even under status. Can you show me a screenshot of your values in SignalCheck?
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Under status on TW the dbm and asu is representative of whatever network you're on 1x, 3g or LTE. The signal bars however only represent your voice signal strength(1x-rtt).
°•○●¤◇★S☆A: Son's of Android★◇¤●○•°
I like to break stuff!

-EViL-KoNCEPTz- said:
Under status on TW the dbm and asu is representative of whatever network you're on 1x, 3g or LTE. The signal bars however only represent your voice signal strength(1x-rtt).
°•○●¤◇★S☆A: Son's of Android★◇¤●○•°
I like to break stuff!
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No it is not. Here is proof.

Fire Ball said:
No it is not. Here is proof.
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Edit: never mind. I misunderstood his post.

LTE always reverting to 3G/H/H+ on ALL custom and all stock roms

I had LTE for around a month, then out of nowhere, no updates, nothing it disappeared, it's been gone for almost 2 weeks now.
My carrier (O2-UK) says there is no issue, I have literally no idea, I am almost certain it's just Oneplus phones.. but anyone have any info?
As I said, I've tried custom ROM, I've tried all the stock roms clean flashed.

ritchiedrama said:
I had LTE for around a month, then out of nowhere, no updates, nothing it disappeared, it's been gone for almost 2 weeks now.
My carrier (O2-UK) says there is no issue, I have literally no idea, I am almost certain it's just Oneplus phones.. but anyone have any info?
As I said, I've tried custom ROM, I've tried all the stock roms clean flashed.
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The latest update oos3.4.2 has this issue. However, oos3.2.2 didn't have this issue as my LTE was connecting fine in India.

sidagg said:
The latest update oos3.4.2 has this issue. However, oos3.2.2 didn't have this issue as my LTE was connecting fine in India.
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I've tried all roms, all OOS versions. Same issue.

No one else has this issue?! Saw a few on google but no fixes...

I can say that my phone often sticks to edge when I disable the wifi, it won't switch to 3g/4g unless I enable/disable it. I believe this was not the case with oos 3.2.1, with which my phone came with (only have it for a week now). This also happens with CM13. I think there was a update to the radio in the last oos update, so this might be the reason.

I am currently on OxygenOs 3.2.4 and my Lte seems to work properly. I tested it on a 4g area for about an hour or more and lte sticks with no drop to 3g. I will test it more and report back.

Lownita said:
I can say that my phone often sticks to edge when I disable the wifi, it won't switch to 3g/4g unless I enable/disable it. I believe this was not the case with oos 3.2.1, with which my phone came with (only have it for a week now). This also happens with CM13. I think there was a update to the radio in the last oos update, so this might be the reason.
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I used to have solid good 4G here, now I don't no matter what I do. It isn't a network issue either

Did you double check your data SIM card is set to LTE? I had that setting change to 3g through a weird mix of circumstances. Was miffed I wasn't getting 4g and it turned out my SIM was set to 3g max.

nispen said:
Did you double check your data SIM card is set to LTE? I had that setting change to 3g through a weird mix of circumstances. Was miffed I wasn't getting 4g and it turned out my SIM was set to 3g max.
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I get LTE if I go somewhere else, eg just outside off where I live.
But I had very good LTE where I lived too, inside, outside, then a week or two ago it vanished.

same here always reverting from 3g to 2g biggest issue with this phone
please fix this 1+ we all having hard time with this issue
my 1+3 never stays on 3g or LTE always go back to 2g

Silly suggestion, but are you on the correct APN? My oneplus initially connected on the incorrect APN for my carrier and I wasn't getting LTE, but 3G/H. Once I corrected it, my LTE was constant in the places it should have been.

Works fine for me you probably just getting a stronger h+ signal and it's jumping between mast's

fermata_ said:
Silly suggestion, but are you on the correct APN? My oneplus initially connected on the incorrect APN for my carrier and I wasn't getting LTE, but 3G/H. Once I corrected it, my LTE was constant in the places it should have been.
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Yes I am

TheLoverMan said:
Works fine for me you probably just getting a stronger h+ signal and it's jumping between mast's
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That would make no sense. I had LTE for a solid month sat right at this desk, now, none.

Where I am in the UK we have loads of cell towers around me and it's always jumping about. There is an app that lets you pick what cell tower you want to use, I have forgotten it's name but might be worth a look. Or could be they doing work in your area. Sorry can not think what else it could be

The oneplus 3 and oneplus 2 just don't like LTE, they will find any reason to go to H+/3

Same issue
I am on Three UK, have came from a Galaxy S7 Edge, and that got constant LTE in most areas, now my phone seems to prefer H+ a LOT more than LTE, reverting to it whenever it can, not great, OnePlus really needs to address this issue, wouldn't mind so much if LTE in my area wasn't 75Mbps, compared to 10Mbps on H+

Grudenkles said:
I am on Three UK, have came from a Galaxy S7 Edge, and that got constant LTE in most areas, now my phone seems to prefer H+ a LOT more than LTE, reverting to it whenever it can, not great, OnePlus really needs to address this issue, wouldn't mind so much if LTE in my area wasn't 75Mbps, compared to 10Mbps on H+
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Same issue, same carrier, same frustration

Put me down for the same issue. With faster battery drain on 3.2.4, as well as random complete "no service" signal loss, for maybe 5 seconds. It's annoying as sin, and very disappointing. OnePlus at least is aware of the issue:
https://twitter.com/OnePlus_Support/status/765659124642222081

Fix
Have found no fix, have reverted to S7 edge, has MUCH better LTE and more reliable signal overall.

Weak antenna?

Seeing 4 bars of LTE signal strength on my phone is like seeing a unicorn.
I live in Upstate NY and I have the A705MN phone.
I have tried three different sim cards, all of them of course GSM compatible. The result is exactly the same among all three. I typically get 1 or 2 bars LTE.
My previous phones under the same carrier and same sim card were typically 4-5 bars. (The Wifi strength, BTW, is equal to what I've seen from my other phones.)
What can I do to improve the signal strength?
I've seen posts by those with S10's where they do something to disable specific bands. But I'm not sure how to do that on the A70 phone. I've tried the specific codes that were mentioned in threads for the S10, but those codes do not work on the A70.
Please help. As much as I like the Samsung otherwise, this factor might be the reason I return the phone.

Yes same problem here

106IFA said:
Seeing 4 or 5 bars of LTE signal strength on my phone is like seeing a unicorn.
I live in Upstate NY and I have the A705MN phone.
I have tried three different sim cards, all of them of course GSM compatible. The result is exactly the same among all three. I typically get 1-3 bars LTE.
My previous phones under the same carrier and same sim card were typically 4-5 bars. (The Wifi strength, BTW, is equal to what I've seen from my other phones.)
What can I do to improve the signal strength?
I've seen posts by those with S10's where they do something to disable specific bands. But I'm not sure how to do that on the A70 phone. I've tried the specific codes that were mentioned in threads for the S10, but those codes do not work on the A70.
Please help. As much as I like the Samsung otherwise, this factor might be the reason I return the phone.
Click to expand...
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Try LTE only settings in settings>connections.

senseijtitus said:
Try LTE only settings in settings>connections.
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Thank you for the screenshots.
I edited the access point that I'm using and changed it to LTE. But then when I go to select network mode, I cannot chose LTE Only. That option does not show up. I have tried rebooting after editing and selecting the Access Point, and I still do not see that option.
I have tried using apps such as 4g Network Only and have switched to LTE only, but that change does not seem to make a difference or the network goes down altogether.
Any suggestions?

senseijtitus said:
Try LTE only settings in set5ings>connections.
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There was a post in the forum for using settings editor app to enable LTE only option. It will enable this option for both sims.

senseijtitus said:
There was a post in the forum for using settings editor app to enable LTE only option. It will enable this option for both sims.
Click to expand...
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I haven't been able to do this or find what it is you're referring to. I've tried adding a few values through Settings editor apps. Values such as "hw_networkmode_preference" etc.
Doesn't work.
But besides, why would setting the connection to LTE only fix this problem? I don't see how this is not a herring.
Most of the times I am see 2 bars of strength. Every now and then I get 3 bars, and more frequently than that I get only 1 bar. 4 bars is quite rare.
The real problem with this antenna is that if I step inside a supermarket or bathroom then my connection is gone. If I'm traveling around the state of NY, in more remote areas, I'm sure I will not have a chance of any connection.
I would LOVE this phone if it had a better antenna. I can deal with the subpar fingerprint reader. Just give me a strong antenna like all of my previous phones and then I'd be a happy camper!
I decided not to return the phone so I am stuck with this phone.

106IFA said:
I haven't been able to do this or find what it is you're referring to. I've tried adding a few values through Settings editor apps. Values such as "hw_networkmode_preference" etc.
Doesn't work.
But besides, why would setting the connection to LTE only fix this problem? I don't see how this is not a herring.
Most of the times I am see 2 bars of strength. Every now and then I get 3 bars, and more frequently than that I get only 1 bar. 4 bars is quite rare.
The real problem with this antenna is that if I step inside a supermarket or bathroom then my connection is gone. If I'm traveling around the state of NY, in more remote areas, I'm sure I will not have a chance of any connection.
I would LOVE this phone if it had a better antenna. I can deal with the subpar fingerprint reader. Just give me a strong antenna like all of my previous phones and then I'd be a happy camper!
I decided not to return the phone so I am stuck with this phone.
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Setting the band to lte only would help in better reception even at low signal strength. One thing I had noticed in lte band is its consistency in connection speeds and call quality even with low signal. I think this is because of the high bandwidth of the lte signals. But I'm not an expert in it. Try changing the band to lte only. It should work better.

senseijtitus said:
Try LTE only settings in settings>connections.
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Where did get this theme and icons in screen shots ?

Maystro said:
Where did get this theme and icons in screen shots ?
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Bodhosativa theme from xda apps section.

senseijtitus said:
Setting the band to lte only would help in better reception even at low signal strength. One thing I had noticed in lte band is its consistency in connection speeds and call quality even with low signal. I think this is because of the high bandwidth of the lte signals. But I'm not an expert in it. Try changing the band to lte only. It should work better.
Click to expand...
Click to collapse
But I'm trying to get better signal, rather than better reception with low signal.
There's got to be something wrong with my phone. It blacks out if I step inside a bathroom in a building and such and it's very rarely at 4 bars.

A thing I noticed. If I go and select 2g/3g only (switch off 4g lte) my signal reception instantly switches to full (4 bars) Usually I get around 2 bars with LTE active.
The strange part is that even with lte off I can still receive an lte 4g signal when outside..this is perfect for me as it means i have a really strong signal (reception) indoors but still have the benefit of 4G outside. I don't quite understand it tbh. I mean i have switched to "2g/3g only" yet i still see 4G pop up in the status bar on my commute, and it definitely receiving 4G speeds. I'm not sure if it's a bug or not but I kinda like it.

Con500 said:
A thing I noticed. If I go and select 2g/3g only (switch off 4g lte) my signal reception instantly switches to full (4 bars) Usually I get around 2 bars with LTE active.
The strange part is that even with lte off I can still receive an lte 4g signal when outside..this is perfect for me as it means i have a really strong signal (reception) indoors but still have the benefit of 4G outside. I don't quite understand it tbh. I mean i have switched to "2g/3g only" yet i still see 4G pop up in the status bar on my commute, and it definitely receiving 4G speeds. I'm not sure if it's a bug or not but I kinda like it.
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That's a terrific idea. Thank you for bringing that up.
I am implementing your suggesteion and it's nice to see 3-4 bars of strength again.
I don't need the fastest data connection. I just need a strong or secure basic data connection, since most of the time I'm not doing anything data intensive with my phone anyway when I"m away from a wifi connection.
But I'm not sure if my phone hops up to LTE at anytime.. I wish had the same "bug" that you do. I just started testing with your settings so I'll see if I can get it so that 3g is the preferred and basic network and 4g is the optional...

After another day, I'm back to LTE/3g/2g auto.
The general reception even for 3g or 2g is lower overall than what I saw from every other phone I have used. So in areas where I can expect to have a relatively low signal I get a particularly low signal for all bands, 4g, 3g, and 2g. That being the case, there's no practical difference if I cap my connection or not.
Samsung better warranty this phone. Does anyone know who I should call?

Since I bought my phone through an Ebay seller and the phone is West Carribean stock, not USA stock, which is where I am, I have no warranty on this phone.