yashsingh1/xdaforums huggingface dataset:
[LG Optimus 3D] botson71:
Then you are lucky. As I said before, after I upgraded to 21A I didn't experience any ghost calls the first 3 weeks. And after the first ghost call, I was having more ghost calls every 2-3 days. With the 21D I just experienced one ghost call but after a full wipe I didn't get any ghost call so far that I'm aware of (running 21D for more than a month now).

With the 21A I was mainly getting ghost calls when the mobile data was off, no matter if the phone was on 2G or 3G, while the phone signal bars at the top were getting white instead of the normal green color.

Also, how do you manage to get >220MB free RAM and also not able to go below 100MB free RAM with the 21A? Any GB stock rom I used, they had very bad memory management. With the 21A my free RAM after killing all apps (with the LG app killer) I usually had 130-150MB free. And as soon as I was running few "typical" apps (browser, twitter etc) the RAM was getting down to 50-70MB.

Would you care to share which apps you disabled from start-up and/or frozen?
[LG Optimus 3D] vpamir:
Guys i need help. I screwed up again. I need the clockwork mod recovery backup file of the stock gingerbread (any version) system partition. I'm on CyanogenMod 7 RC1 now and LG Mobile Update tool can't flash any .kdz files and since i deleted my official gingerbread backups - stupid me - i can't restore from CWM recovery and i'm stuck. If someone may backup only the system partition and upload then i may be able to fix it. Please?

And a note about V20G and CyanogenMod: Cyanogen mod doesn't work with the V20G baseband. I tried with RC1 and the latest nightly and it's the same.
[LG Optimus 3D] lw_wl:
i think u should enjoy the good time right now!

i didnt have any ghost call at the first month. and i told everyone i dont have ghost at all. just like u do right now!

until one day my boss asked me why i keep ignoring his phone call. then i knew what happened.

i got ghost call in the basement elevator. but my samsung phone works perfectly in it. its a signal covered elevator.

---------- Post added at 11:49 AM ---------- Previous post was at 11:43 AM ----------

i think u should enjoy the good time right now!

i didnt have any ghost call at the first month. and i told everyone i dont have ghost at all. just like u do right now!

until one day my boss asked me why i keep ignoring his phone call. then i knew what happened.

i got ghost call in the basement elevator. but my samsung phone works perfectly in it. its a signal covered elevator.
[LG Optimus 3D] superage:
I use apps called "System Tuner". There are an option to disable apps from start up list.

I did "Clear Data" from Application Settings to stop apps like "Google Map", if I did stop only, the apps will restart automatically and would be running again, so I did "Clear Data" to stop it.

I was making lot of calls, is it still not enough ?

I am fully aware that many people are still experiencing the problem. That is why I keep trying to do more tests, at least I really would like to know the root cause of the problem. Well, may be we may not get any solution from the test, but at least we can find the exact problem.

I am working as radio access engineer and I hope with my experience I can track down or may be perform some trace within air interface protocol to find if we actually having problem with the handset or may be with the carrier/network, sometime the solution can be apply in carrier side, without having changes on the handset.

You said, you got a ghost call when you are in poor coverage, so technically, this was probably happening with you, may be the base station controller already sent you "Alerting" procedure (the procedure which indicate the phone having incoming call) but perhaps it never reach the phone and core network already trigger "Ring Back Tone" for caller, there is a timer for this procedure, am not sure for how long but sure if there are no response from the handset "Connect" procedure. Then the call will drop by the network controller and yes the called number never know if he got a call or not, this is what we understand as a ghost call.

Every phone must follow the same procedures according to international standard, to measure the quality, "RX level" and "RX quality". Probably LG O3D having coding problem to measure it and also can be the quality of HW and most likely also the radio environment affecting the call, so the combination of these problem may produce a ghost call.

I cant tell so sure but my phone always get a good coverage at the office and even in my apartment the signal always showing good indication.

Until now I am still interesting to find the exact problem we have.
[LG Optimus 3D] lw_wl:
a friend of mine claimed he can easily make a ghost call example just simply stand next to the computer department, but now, after flashed in the V20G, he cant repeat the ghost call by doing so.

so maybe checking with the V20G baseband would learn more about it than guessing what happen to the carrier.

even there is something wrong with the carrier, why others phone like samsung still working fine?

its pointless to discuss the network.
[LG Optimus 3D] superage:
I cant tell until I am sure the "alerting" procedure has been sent to phone or not. If "alerting" procedure never arrive to our phone, that could mean 2 things:

1. Poor Coverage

2. HW on the phone having reception issue.

Im still suspecting it could be combination between network issue and handset issue.

If "alerting" procedure hit the phone but the phone not reacted, then something must be wrong with the phone e.g could be ROM, could be baseband, could be HW issue, could be "signal interference"

You saying it is easy to trigger a ghost call when your friend stand close to the computer store ? This is an example, different place, different radio environment also could be the reason. If you still have the previous problematic ROM, please, if you can, and if you have time, try to have that ROM, then stand there again and check the signal quality. How many dBs you get ? e.g -71 dBm 21 asu. You can have this information on Settings|About|Status.

And again if you saying, Samsung are not experience this problem, it could be that samsung model having good design SW and HW.

As of now, I could say, if the ghost call only happen once in a week, i think still acceptable. I want to hear from some one that having a ghost call almost every day, like 3 times in a day and may be he can do the test like me, 100 calls in 2G, 100 calls in 3G, until he got the the ghost call.

If this ghost call is easy to produce, then I will do it. Standing close to computer store is not an option from me, but I may try to keep my phone somewhere in my apartment which having bad signal quality and will try it.
[LG Optimus 3D] botson71:
1. In my case, all of the ghost calls have occurred at work or at home, both places with very strong signal/coverage.

2. If there is a HW and not a SW problem, wouldn't that affect the phone when Froyo is installed instead of GB? So far there wasn't any reports of ghost calls on Froyo.

As for this being a combination between network issue and handset issue, it could very well be. A member has previously reported that he doesn't have any ghost calls on one network while he constantly has them with another network operator (you can read his post here)

Regarding ways to reproduce the issue, I'm afraid I haven't read any reliable way. In my case as I said, the ghost calls were occurring mainly when the signal bars at the top had white color instead of the normal green color. But this was happening mainly on v21A and never on v21D.

You could try this since you have the 21A: Turn off mobile data and put the phone to sleep for 10-15mins. Then wake up the phone and check the color of the signal bars? Is it white? Try to call the O3D, and perhaps you'll have a ghost call. If the signal bars are green you (or better, I) won't experience a ghost call.
[LG Optimus 3D] sak500:
See how fast HTC's response to issues of their flagship model One X.. Was on the forum since was interested in picking up HTC One X but will wait for Sam's Galaxy SIII.

http://xdaforums.com/showthread.php?t=1617009
[LG Optimus 3D] superage:
Thanks for the suggestion, really appreciated. I have followed what you said and I did try for 15 times, and after that I tried another 10 times but without waiting for 10 minutes, if I see the signal bar goes white, then I make a call to my O3D.

Yes, after I wake up my phone (sleep for 10 minutes), the signal bar color always white and then I make a call to my O3D from my O2X. Keep calling until 15 times, in every 10 minutes and always successful.

Actually, I have an habit turning off everything. So this is my daily settings from the first time I used O3D.

1. Mobile Data always OFF. I turn it on only if I would like to use it.

2. 2G Only (most of the time, like at home). Select auto in the office (around 9 hours per day)

3. WIFI OFF

4. GPS OFF

5. Bluetooth OFF

6. Having Dummy APN, I knew this is useless but I have to avoid problem when my son playing with my phone, so if he turn on the mobile data, he still unable to get the internet until I select the correct APN.

I also did another test, I put my phone very close with my laptop and having Wifi On (Laptop). Make 30 calls and always successful.

And I also have another habit, I always charge my O3D whenever the battery goes below 15%, so usually I charge it once every 3 days.

I never use any custom ROM, I only did upgrade to GB using LG mobile update tools, and I never flash the KDZ manually, it is automatically download by the tools, and I dont know if the tools actually downloading the KDZ. I did only once, then root it and install the CWM.

I really want to know the best and right way to produce the ghost call, I believe I will have one and am waiting for it so badly. I have put my number for trace, so any radio access message will be recorded. Whenever it happens, I will know exactly, if this is phone issue, network issue or combination between phone and network.

Please, any one, if you have the best method to produce the ghost call, let me know. I would love to fix this issue and the most important thing, to know the cause of this problem.
[LG Optimus 3D] lw_wl:
its not the hardware issue, because all of the haunted o3d can end ghost calls for good by switch back to 2.2.2 froyo!

and the hundreds calls test is useless. because the ghost call just like the issue of 'sleep to dead' on optimus 2x . if you keep calling it, it wont sleep! and no ghost!!!

and there is an other way you can try. before we go there, i need to tell you, i didnt say the elevator outside of my apartment is a poor signal area. it has strong signal. it just has its own signal devise, when people in and out, the signal bar on the phone goes full>shut down>wait a second>full signal again. so

you should let you phone sleep, and move from different signal switching boundary!!

again! its the software issue! dont find any excuse for the dev in lg company.
[LG Optimus 3D] superage:
Optimus 2X ? I never test ghost call on O2X. :) I have 2 phones, and I bought it at the same time, O3D and O2X. Please read my posts again.

Calling Number: O2X, Galaxy Tab 7.7

Called Number: O3D

I am not trying to find any excuse here and also I will never blame any developers any where, even its from LG itself.

My objective is only to find the root cause of this problem and if possible, I also will try to provide the solution, as I am a user too and I am working in a place that need very high reliability.

Well, I have a good news, this morning I wake up so early and do more tests and eventually I discover how to produce a ghost call, and I will share the method shortly. I also already have a quick conclusion about how this ghost call happening. To have the fix, am sure not that easy, but I can give it a try or perhaps some one also can joining me.

I will also attach the screenshot from my O3D, to make it very clear for all of you. Now I have to get back to work, I will update you again soon.
[LG Optimus 3D] uvigii:
I also keep everything turned off. But unfortunately I've got a GC.

I think that if you press 'call end' and shortly after that 'power' button phone goes to sleep and display lights stays on. Maybe these 2 issues are related.

Cheers
[LG Optimus 3D] superage:
Here is the method I use to produce a ghost call and 100% will happen, try several times if the first attempt failed.

#1. Setup network mode: GSM/3G auto. Then make sure you are on 3G. Check the Bar.

#2. Make a call from any phone to O3D and Wait 2-3 seconds.

#3. Immediately change network mode: 2G only

#4. The calling phone will hear ring back tone and O3D now move to 2G and will not having incoming call. This is our issue.

You can do the test also from 2G to 3G as well. Setup to 2G only on first point #1 and Change to 3G only on third point #3.

Probable cause:

1. O3D unable to perform and handle or follow the correct update location procedure when specific events happening which causing update location to different RAT.

Sample of triggers: low signal reception, low quality (signal good, but bad quality with high noise in the air interface).

Update location from different RAT e.g 2G to 3G, or 3G to 2G, trigger by poor quality network.

RAT = radio access technology, can be GSM (2G), CDMA (2G/3G EVDO), WCDMA (3G) or LTE (4G)

2. O3D unable to perform cell re-selection at the same RAT. Every carrier has different strategy for this one.

Probable fault:

1. Baseband (the most suspected)

2. Carrier setup for update location and cell reselection (high factor)

Solution:

I will try to decode the baseband file and try to understand its setup.

Otherwise, have to wait until LG release the solution.

Hope this will help you understanding our O3D issue and my theory can be wrong too, so we all now trying to learn from this issue.
[LG Optimus 3D] babak:
maby finaly we have our fix ;)

GB 21e from LG:

http://xdaforums.com/showthread.php?p=25659128#post25659128
[LG Optimus 3D] vpamir:
Nevermind, i fixed it. I'm running V20D with V20G baseband now.
[LG Optimus 3D] superage:
I hope this software update (V21E) comes to my O3D. :)

I just did quick check and input my IMEI and still the most updated on for my O3D is V21A.

http://csmg.lgmobile.com:9002/csmg/b2c/client/auth_model_check2.jsp?esn=IMEI&model=LGP920&country=ES&region=E

OK 357116042xxxxxx LGP920 ANEUML 108KPFX2xxxxx 20110823 V21A_00 http://csmg.lgmobile.com:9002/swdata/WEBSW/LGP920/ANEUML/v21a_00/V21A_00.kdz http://csmgeic.lgmobile.com/swdata/WEBSW/LGP920/ANEUML/v21a_00/V21A_00.kdz GLOBAL/EIC N N EL GSM
[LG Optimus 3D] ©ZEUS®™:
FYI: I tried this method with v20g but didn't work. I've called myself just after passed to 2g from 3g or vice versa but all I got was an operator message, not a ghost call.
[LG Optimus 3D] ©ZEUS®™:
Guys, is it possible to me to use a custom rom with v20g baseband? For example the Thiaiz rom?
[LG Optimus 3D] superage:
Yes. You also could hear an operator message if the condition not meet (2-3 seconds before moving to 2G from 3G), as I wrote on my post, you have to try for several times.

If 2-3 seconds not enough, try to step +1s. e.g 4 seconds, 5 seconds.

I confirm the ghost call always happening if you try this method, but you have to try several attempts until you have it. :) and Yes, I did test on my O3D which running V21A, perhaps it would be different with your case, having V20G.
[LG Optimus 3D] vpamir:
V20G baseband doesn't work with CyanogenMod 7 RC1 and the latest nightly build. I tested it and it doesn't work. For other custom roms i'm not sure...

Does anyone know a way to see detailed information (build date and stuff) about the installed baseband besides the usual "about phone" screen when on official rom?
[LG Optimus 3D] pandaball:
No. That information is contained in build.prop and always reflects the same line across all stock roms, which is L6260_MODEM_SIC_01.1042.00.
[LG Optimus 3D] lw_wl:
why u thinking test ghost call on o2x?

i didnt say o2x has ghost call issue.

Some o2x have 'sleep to dead' issue, pls read before u post.

sleep to dead is the old issue of lg phones, i found this info from the lg phone forum.

ghost call is the new one.

i am thinking somehow they came from the similar mistake.

sleep-to-dead failed to activate the system. ghost call failed to activate some parts of the system.

and the froyo kill the battery fast than GB. GB got ghost call, froyo does not. so do the thinking!
[LG Optimus 3D] dreccon:
@superage

Can you pls clarify, at pt.#2 of your ghost guide, do we answer the call on the O3D or just let it ring?
[LG Optimus 3D] botson71:
It doesn't work with my O3D but this is probably because I have the V21D which has less ghost calls incidents.

Nice find, nevertheless. This could also explain why many people have less (or no) ghost calls when they activate the 2G-only mode.
[LG Optimus 3D] superage:
Perhaps we miss understand each other and now I am getting what am looking for.

Do not do any action on O3D. If you get a ghost call, the O3D wont ring and the caller will hear ring back tone.

Yes. I think so, I read also in many posts, there are some people reported less or no ghost call when they camp on 2G only.

To have a fix solution by modifying the baseband seems impossible for me.

I try to compare the binary between 2 basebands file but it has lot of differences.

Unless some one have a procedure to decode the baseband file.

Yesterday, Italy got a new update V21E and reported to have fix for ghost call and battery stats, may be this is the solution we are waiting for. :) I will upgrade to V21E may be a month later. As of now I am happy enough with my O3D V21A.
[LG Optimus 3D] dreccon:
I just reproduced a ghost call using superage's method. I'm calling LG customer service on Monday for a refund!
[LG Optimus 3D] cassianog:
This makes sense to me. I've downgraded to Froyo but at my last days with gingerbread, every time I moved around town and, consequently, through several cells, invariably I would arrive at my destination in a ghost call situation.

I also noted that when I use my Optimus 3D with tether out as a router, constantly connected and with data flowing, the occurrance of ghost calls never happened.
[LG Optimus 3D] sak500:
I've tried the above 5~6 times and reversing from 2g to 3g as well, either the call comes on o3d or my dialing phone gives busy tone or unavailable msg. Usually when switching to 2G only phone takes some time to get the network during that time the calling phone gets busy or unavailable msg. When i uncheck 2g and at the same time call from other phone, O3D rings.

I guess GC is thing of past on V20G :D

Using V20G.
[LG Optimus 3D] superage:
I think so. :) Hope no one will report about ghost call on V20G.

Some one post on the other thread that V21E baseband also having a ghost call. This is not a good news if it is really happening. I was expecting V21E to resolve this major issue.
[LG Optimus 3D] botson71:
If I remember correctly, you had the 21D rom on your O3D? I couldn't reproduce the issue with my 21D.
[LG Optimus 3D] dreccon:
No, I have v21a preinstalled from LG Service. It's in my signature. I have decided I won't play technician for LG and every time I have a ghost call I send it to Service and they replace my mainboard. I think this time they will offer me a permanent solution (another model or a refund).
[LG Optimus 3D] botson71:
Oh, sorry, I have the forum signatures turned off. I agree, anyone who still experiences ghost calls should do the same. This is the only way that will really make LG take notice and acknowledge the problem.

And since you are in Greece, there is an EU-wide regulation about faulty products which states that if a product gets defective the first 6 months after the purchase, you have the right to get a new product or a full refund.
[LG Optimus 3D] ©ZEUS®™:
Sorry to say but I've already reported ghost calls on v20g a few pages ago. I just couldn't catch a gc with your method.

For the record: I am experiencing ghost calls with v20g (29-march-2012) almost every day for 1 or 2 times, randomly. But phone solves the issue more quickly than the previous versions.
[LG Optimus 3D] Meemo23:
I've been on 20G for 3 weeks now and not one ghost call what so ever, loving the O3D ever since i changed my baseband to V20G.. Now the new V21E is also awesome i have yet to experience any..
[LG Optimus 3D] lw_wl:
it seems different country using same version code, i dont think V20G of China hasn't been released in 29-march-2012 .so do u remember which countrys V20G u have tried ?

and the Italy V21e should be another fix after China V20g.
[LG Optimus 3D] GentlyCriminal:
That's right! It has been released on 11th of april, so far anyone reported about a ghost call with this rom, I also haven't experienced one since two weeks!
[LG Optimus 3D] cheong12001:
After i have checked the firmware list, only one 20g are released from beijing china.
[LG Optimus 3D] linusmax:
I live in Italy and in my office ghost call is a great problem. In two previously week i have installed stock 21D release with great problem for ghost call. After i have only installed BlueKernel 1.09 fix 2 in recovery mode and i have solved. No more ghost call for one week.

It is possible that the problem is in baseband but because i have solved with kernel ?

I not have do any wipe or reinstall procedure. I have only replace Kernel.

Yesterday i have installed 21E and in 24 hours no ghost call. In next week i can do more test on V.21E.
[LG Optimus 3D] sandulea:
Well, I started writing this post thinking I was going to bring proof of ghost calls on the italian v21e as well, but after further tests I can't say whether the following represents a good or a bad sign.

If you longpress the 3d button and you uninstalled the 3d space app (or whatever app the button initially launched) the phone reboots, during which time all received calls are ghost calls, but as soon as android is done booting and is at lockscreen, the (ghost) call being received is instantly rejected by android, so the caller hears a busy tone, as if you rejected the call. This happens even though by this point (reaching the lockscreen after rebooting) the phone has no signal, and the wifi doesn't work either.

While lg obviously didn't account for the 3d app being absent during use when making the rom, which leads to this, I'm not exactly sure what to make of this behaviour. Obviously, any instance of ghost calls is further proof of the inability of certain people to do their jobs, but on the other hand it looks like it recovers quite fast when it happens, and I haven't been able to recreate ghost calls by any other means.

I'll be doing some tests tonight on other android phones to see their behaviour in when they're called during this booting phase, because I currently don't have anything to compare this to.

Maybe this will help the LG guys a little, because it's the only way I could constantly produce a ghost call at will so far (i only had a few incidents even on v21a, it wasn't as bad for me as it was for others who had several gc and crashes a day).
[LG Optimus 3D] dromico:
Today is the second day of 21e italian rom .

Until now no ghost call.

My experience is:

Good data connection ( as other GB Rom with Froyo sometimes with vodafone I have to recall web pages many times for see something )

Battery seems not bad

Generally good interface, as GB correct some little things of froyo.

On friday I tried the automatic update, but my phone is Vodafone Branded and the LG update software flash the V20 in my phone :( , then in the first few hours of use I have ghost call... In the evening I flashed the 21e kdz file ( not only baseband ) and now I'm using the phone without root or custom rom.

2 days without ghost call VS few hours... I think that lg made something for the problem, I hope is not only a strange patch but a real FIX, I think I will use this ROM during next week, I will let you know fro everything out of normal.