I have recently acquired a Samsung s10e and would very much like to install LineageOS (Official).
Wifi Calling is an absolute necessity for me, as I live in a rural area (UK) with very poor signal coverage.
Can anyone confirm whether WiFi Calling (and VoLTE) is working on the latest version of LineageOS for the s10e? Both work fine on the stock ROM.
Many thanks in advance.
I am on lineage 20.0, Samsung S10e. Preferred network type "LTE" is available as an option in SIMS settings. I'm not sure if it works or not - no VoLTE symbol nest to signal strength in status bar. No VoWIFI option that I can find. Not sure if this helps your query!
Thank you for your reply,
I have now installed Lineage 20 on my S10E, and have confirmed the same settings. I have decided that a de-googled phone is more important to me than WiFi calling for the time being! I wonder if there is any chance that the Samsung framework problem will ever be solved?
Please excuse my ignorance, but my main concern is that when 3G is turned off (sometime next year in the UK), Lineage will stop working on this device. Do you know if VoLTE is necessary for 4G use, or is "LTE" connection sufficient?
I have decided the same - de-googled and de-samsunged! The Lineage OS is so much cleaner and faster.
VoLTE is required to make a voice call over the 4g network. You can still make calls over 4g or wi-fi using data via a messenger type app if that helps. I think it is also possible to make calls on S10e Lineage using 2g and that network is not being switched off for a few years yet.
Also, O2 have not announced when their 3g network is being switched off in the UK so might not be for a while - as the phone is dual SIM you could get another SIM card to help with poor signal coverage?
For now I think it is worth living without VoLTE - it is a price worth paying!
Exactly my thinking!
The VoLTE is a medium term concern, but my real problem is the lack of WiFi calling. I live in a rural area with atrocious signal levels, so it would make so life so much easier, but, as you say, for the moment it's a price worth paying.
I wonder if there is any hope for a replacement for Samsung's framework on this device????
Related
My OnePlus One is on latest cyanogen 12.1, completely stock and unrooted. I am noticing high battery drain on cell stand by (42%)
and of that 52% of the time there is no connection to carrier.
Is there a fix for this issue? My wife's Note Edge (SM-N915G on stock KitKat) has no signal issues with T-Mobile. but my OnePlus One show no connection most of the time. Is this a CM12.1 issue or is this a known issue with OPO and T-Mobile combination?
Appreciate the help.
Which baseband?
This could just be because of where you're located. The OPO only supports one of T-Mobile's LTE bands, band 4, while the Galaxy Note Edge supports all three, including band 12, which has much greater range and building penetration.
All of the recent T-Mobile commercials touting improved coverage area and better building penetration are based off of using band 12 on their newer devices which support VOLTE (voice over LTE). All of their new towers incorporate this band in areas that previously had little or no coverage (especially rural and suburban).
If you're in an outlying area with poor band 4 coverage your handset will be constantly trying to lock in on the weak signal and shifting from 3G, 4G, and LTE. Doing this also greatly reduces data transmission speed and reduces battery life.
If you're in an urban area with strong signal acquisition, then forget what I just said, you have another issue.
Hope this helps.
i used OPO on tmobile and it worked fine, depends on many factors including location, time of day and of course the bands used by the device.
karthics4 said:
i used OPO on tmobile and it worked fine, depends on many factors including location, time of day and of course the bands used by the device.
Click to expand...
Click to collapse
I see from your profile that you reside in the UK. The OP doesn't list his, so I'm operating under the assumption that he's here in the states. My observations and comments in the post above yours, are strictly based on what I know about this device and with T-Mobile USA, as I'm unfamiliar with its operations in other countries.
Odysseus1962 said:
I see from your profile that you reside in the UK. The OP doesn't list his, so I'm operating under the assumption that he's here in the states. My observations and comments in the post above yours, are strictly based on what I know about this device and with T-Mobile USA, as I'm unfamiliar with its operations in other countries.
Click to expand...
Click to collapse
Apologies, should have included location detail. This OPO is in Austin, tx so its metro area.
Baseband: DI.3.0c6-00241-m8974aaaaanazm-1
Cynogen version: 12.1.1-YOG7DAS2K1
Kernel version: 3.4.67-cyanogenmod-g9220ae3
Build: LMY48Y
Will I get better luck on AT&T with OPO?
Agent5150 said:
Apologies, should have included location detail. This OPO is in Austin, tx so its metro area.
Baseband: DI.3.0c6-00241-m8974aaaaanazm-1
Cynogen version: 12.1.1-YOG7DAS2K1
Kernel version: 3.4.67-cyanogenmod-g9220ae3
Build: LMY48Y
Will I get better luck on AT&T with OPO?
Click to expand...
Click to collapse
You might, but I can't say for sure. The OPO supports 2 of the 3 bands AT&T utilizes, band 4 (like T-Mobile) and band 17. So you have more of a chance. Bear in mind, that AT&T is considerably more expensive than T-Mobile and that they have roaming agreements with each other, where if you can't get any signal for telephony you'll roam off the other's network.
Generally speaking AT&T has more coverage, because it's an older more mature company with a more established infrastructure. T-Mobile is more of an upstart, but is rapidly expanding with a newer technology. Like I said in the previous post, explaining why your wife's Note got so much better reception, newer T-Mobile devices which support all 3 LTE bands (2,4, & 12) get better reception and probably twice the coverage than what is possible with the OPO.
I hope this helps explains things.
Odysseus1962 said:
I see from your profile that you reside in the UK. The OP doesn't list his, so I'm operating under the assumption that he's here in the states. My observations and comments in the post above yours, are strictly based on what I know about this device and with T-Mobile USA, as I'm unfamiliar with its operations in other countries.
Click to expand...
Click to collapse
yes i do reside in the UK but bought my OPO in the US when i lived there back in 2013 and used it on Tmob. according to the website it works in the UK on Three and EE(tmobile/ orange). i use it on three and get 4g and 3g with no probs. i do like the tmobile usa plan of $40 unlimited all
Since stock 12.1 update, I've noticed mobile network keeps dropping and in return draining the battery quickly.
Thinking it's the update, I've installed custom 12.1 ROM, but the problem persisted.
With further searching, I've found fix here.
https://forums.oneplus.net/threads/cos-12-1-non-rooted-user-w-mobile-connectivity-issues.361244/
Goto APN settings, take note of current APN's.
Reset to defaults.
Copy previous APN values to currently selected APN.
Save then reboot phone.
If above doesn't work, try here.
https://forums.oneplus.net/threads/update-17-09-15-cos-12-1-yog4pas1no-bugs-discussion-thread.349560/
Scroll down to LTE issues and try the method described. Just note that it suggest deleting other APN, but I recommend against it because it can interfere with roaming.
byoungc said:
Since stock 12.1 update, I've noticed mobile network keeps dropping and in return draining the battery quickly.
Thinking it's the update, I've installed custom 12.1 ROM, but the problem persisted.
With further searching, I've found fix here.
https://forums.oneplus.net/threads/cos-12-1-non-rooted-user-w-mobile-connectivity-issues.361244/
Goto APN settings, take note of current APN's.
Reset to defaults.
Copy previous APN values to currently selected APN.
Save then reboot phone.
If above doesn't work, try here.
https://forums.oneplus.net/threads/...2-1-yog4pas1no-bugs-discussion-thread.349560/
Scroll down to LTE issues and try the method described. Just note that it suggest deleting other APN, but I recommend against it because it can interfere with roaming.
Click to expand...
Click to collapse
Thanks, so I am not the only one experiencing network connectivity issues. I do suspect this software related to some extent. Will try the fix and report back.
Answer!
Agent5150 said:
My OnePlus One is on latest cyanogen 12.1, completely stock and unrooted. I am noticing high battery drain on cell stand by (42%)
and of that 52% of the time there is no connection to carrier.
Is there a fix for this issue? My wife's Note Edge (SM-N915G on stock KitKat) has no signal issues with T-Mobile. but my OnePlus One show no connection most of the time. Is this a CM12.1 issue or is this a known issue with OPO and T-Mobile combination?
Appreciate the help.
Click to expand...
Click to collapse
All phones can now get WiFi calling. Just download digits and sync it. Download it on your main driver and sync it. You can use the DIGITS to call using WiFi from any device using your number.
Trikkx said:
All phones can now get WiFi calling. Just download digits and sync it. Download it on your main driver and sync it. You can use the DIGITS to call using WiFi from any device using your number.
Click to expand...
Click to collapse
Digits?
I thought that S8+ has better antenna and modem than my iPhone 7+. But I made mistake. It is far worse than 7+. Even I have full bars on 3G it switches back to 2G and if on 4G it switches on 3G. WTF Samsung!?
I need to access service menu and set 3G/4G only but I have another thread about service menu which I cannot access....
Go to settings, connections, mobile networks, and tap network mode. Is 4G/3G/2G enabled? If not, enable it, and see if 4G connects
galaxyYtester said:
Go to settings, connections, mobile networks, and tap network mode. Is 4G/3G/2G enabled? If not, enable it, and see if 4G connects
Click to expand...
Click to collapse
Please READ CAREFULLY what I wrote.
stefan063 said:
I thought that S8+ has better antenna and modem than my iPhone 7+. But I made mistake. It is far worse than 7+. Even I have full bars on 3G it switches back to 2G and if on 4G it switches on 3G. WTF Samsung!?
I need to access service menu and set 3G/4G only but I have another thread about service menu which I cannot access....
Click to expand...
Click to collapse
Which Variant do you have? I had a similar issue when I first bought the Verizon S8+ to use on Cricket/AT&T. I ended up having to return it and get the AT&T one. The first one I had would run on 4G or LTE with 4-5 bars and would constantly loose service, and every time I would try to make a call it would switch to 3G and tell me that international calling was not on my plan until 3 or more attempts later. Then it would finally make the call on 3G network. Since I've swapped I haven't had this problem. No I still don't get as good of signal as my iPhone 7 plus but it's comparable now.
AndroiderM said:
Which Variant do you have? I had a similar issue when I first bought the Verizon S8+ to use on Cricket/AT&T. I ended up having to return it and get the AT&T one. The first one I had would run on 4G or LTE with 4-5 bars and would constantly loose service, and every time I would try to make a call it would switch to 3G and tell me that international calling was not on my plan until 3 or more attempts later. Then it would finally make the call on 3G network. Since I've swapped I haven't had this problem. No I still don't get as good of signal as my iPhone 7 plus but it's comparable now.
Click to expand...
Click to collapse
International Sim-Unlocked 955F variant (EXYNOS). It is OK to switch from 4G to 3G if operator doesn't support VoLTE on its network. But that is not my problem. Full bar 3G, surfing web and it switches to 2G. NOT NORMAL. Same as on 4G to 3G. Full 4G bars.
If you have tried factory reset and all other trouble shooting, I'd just set up a RMA and get a new one. If you are in the US maybe the Snapdragon if you're willing to sacrifice root. Sounds really annoying to have a phone with LTE and be stuck using 2G. Just my 2 cents
Got the same issue...
stefan063 said:
I thought that S8+ has better antenna and modem than my iPhone 7+. But I made mistake. It is far worse than 7+. Even I have full bars on 3G it switches back to 2G and if on 4G it switches on 3G. WTF Samsung!?
I need to access service menu and set 3G/4G only but I have another thread about service menu which I cannot access....
Click to expand...
Click to collapse
Hi Friend, it so true...
I use S8 Plus and experience the same issue. If we only use S8, we will never realized this fail but if we use another device like Sony Experia or Mi5 (my experience), we will realized that S8 has worse signal receiver. I complained it to Samsung through Twitter, just say they will check on it and never get back to my last message.
Kind of mess for an expensive phone and high class brand.
Same with me
mdarsika said:
Hi Friend, it so true...
I use S8 Plus and experience the same issue. If we only use S8, we will never realized this fail but if we use another device like Sony Experia or Mi5 (my experience), we will realized that S8 has worse signal receiver. I complained it to Samsung through Twitter, just say they will check on it and never get back to my last message.
Kind of mess for an expensive phone and high class brand.
Click to expand...
Click to collapse
I'm having the same problem, with 3G makes a hang out signal, and I need to turn on the airplane mode and turn off to get signal and H+ or 4G, did you find a solution with this issue?
Hello All,
In my new home is very low T-Mobile signal strength.
As i know from carrier official page, T-Mobile supports VoLTE and VoWiFi (Wi-Fi calling) in my country.
Now (6 july 2017) i have installed newest LineageOS build. There no option to enable Wi-Fi Calling/VoWiFi, but regarding to official Qualcomm site Osprey's processor (Snapdagon 410) supports Wi-Fi Calling/VoWiFi:
Next-generation Calling Services
Voice over Wi-Fi (VoWiFi) with LTE call continuity
HD Voice over 3G and VoLTE
It is posible to enable Wi-Fi Calling/VoWiFi on Osprey?
This solution does not work. When i make Wi-Fi Calling enable it going back to off.
Device: Moto G 2015 (XT1541)
Country: Poland
Carrier: T-Mobile
ROM: LineageOS 14.1 build from 6 july 2017
mrViZhy said:
Hello All,
In my new home is very low T-Mobile signal strength.
Is i know from carrier official page, T-Mobile supports VoLTE and VoWiFi (Wi-Fi calling) in my country.
Now (6 july 2017) i have installed newest LineageOS build. There no option to enable Wi-Fi Calling/VoWiFi, but regarding to official Qualcomm site Osprey's processor (Snapdagon 410) supports Wi-Fi Calling/VoWiFi:
Next-generation Calling Services
Voice over Wi-Fi (VoWiFi) with LTE call continuity
HD Voice over 3G and VoLTE
It is posible to enable Wi-Fi Calling/VoWiFi on Osprey?
This solution does not work. When i make Wi-Fi Calling enable it going back to off.
Device: Moto G 2015 (XT1541)
Country: Poland
Carrier: T-Mobile
ROM: LineageOS 14.1 build from 6 july 2017
Click to expand...
Click to collapse
FYI For U.S. prepaid T-mobile accounts: T-Mobile may require address and other information to be entered on their website into the account profile for that phone #. If that information is entered on-line and the account has WiFi calling properly enabled it should work when the device has wifi connection and no cellular connection. This is not dependent on any settings on the phone and should work even if you don't see any settings there. You might want to contact your provider about this.
mrViZhy said:
... It is posible to enable Wi-Fi Calling/VoWiFi on Osprey?
This solution does not work. When i make Wi-Fi Calling enable it going back to off.
Device: Moto G 2015 (XT1541)
Country: Poland
Carrier: T-Mobile
Click to expand...
Click to collapse
No, it doesn't work, not with T-Mobile. It won't stay on, no matter what you do.
I have MetroPCS/T-mobile USA, and I have had the exact same issue. I've had no problems using wifi calling on my same account with other phones, but not this one (they do require you to register your full info here, as the last poster said). T-mobile support themselves have told me, however, they only allow wifi calling on phones purchased directly from them, and that's why no go, at least not in the USA. I'm assuming that's their policy in other countries, too?
I don't know if there is a hack/workaround.
Side note: When I go to Europe, which is often, I re-register my old, official t-mobile phone with t-mobile usa, leave my US sim in it, and I use that phone thru wifi calling to still have a US phone while there. I throw a UK sim in my Moto G to use every day.
beachfl said:
No, it doesn't work, not with T-Mobile. It won't stay on, no matter what you do.
I have MetroPCS/T-mobile USA, and I have had the exact same issue. I've had no problems using wifi calling on my same account with other phones, but not this one (they do require you to register your full info here, as the last poster said). T-mobile support themselves have told me, however, they only allow wifi calling on phones purchased directly from them, and that's why no go, at least not in the USA. I'm assuming that's their policy in other countries, too?
I don't know if there is a hack/workaround.
Side note: When I go to Europe, which is often, I re-register my old, official t-mobile phone with t-mobile usa, leave my US sim in it, and I use that phone thru wifi calling to still have a US phone while there. I throw a UK sim in my Moto G to use every day.
Click to expand...
Click to collapse
From what I understand, I could be wrong though, T-Mobile open sourced their WiFi calling and anybody can implement it but LineageOS haven't done it yet. It's a matter of adding the code (just like VoLTE) I think. I don't think T-mobile checks if it's their phone or not, the right software need to run, that's all. The problem is that the software is very low level and needs to part of the kernel, you can't just install some app and make it work. This is what I found when I did my search for LineageOS and WiFi calling a few months back. from T-Mobile forums. Of course anybody can post anything in those forums so it's not official or anything but a few users provided the same answer (some seemed quite knowledgeable) so I believe this is it (probably better than talking so some phone rep reading off FAQ's haha)
rb1979 said:
From what I understand, I could be wrong though, T-Mobile open sourced their WiFi calling and anybody can implement it but LineageOS haven't done it yet. It's a matter of adding the code (just like VoLTE) I think. I don't think T-mobile checks if it's their phone or not, the right software need to run, that's all. The problem is that the software is very low level and needs to part of the kernel, you can't just install some app and make it work. This is what I found when I did my search for LineageOS and WiFi calling a few months back. from T-Mobile forums...
Click to expand...
Click to collapse
It's not unheard of for mobile providers to do just what I'm suggesting t-mobile does. In the UK, for example, Vodafone limits WiFi calling even further than that, to only a few select Voda-sold models (or at least it was like that when I was there recently).
I would very much appreciate being pointed in the direction of guidance by anyone who's been successful in getting it to work on any non-tmobile handset, custom ROM/kernel or not. Thanks much x
IronTechmonkey said:
FYI For U.S. prepaid T-mobile accounts: T-Mobile may require address and other information to be entered on their website into the account profile for that phone #. If that information is entered on-line and the account has WiFi calling properly enabled it should work when the device has wifi connection and no cellular connection. This is not dependent on any settings on the phone and should work even if you don't see any settings there. You might want to contact your provider about this.
Click to expand...
Click to collapse
Hi IronTechmonkey, at first I took it as a fact but later I thought about it and now I'm thinking how would WiFi calling work without LinageOS having code for it. Once you're outside of their network and T-Mobile (others too of course) can't get to your phone through SIM card the only way for anything to work is if the software on the phone through the internet first contacts the provider, correct me wrong but how would the provider get to you? This is just my thinking about it so I'm not sure but what common sense tells. I have the address on T-mobile and everything setup but since I'm not NJ where coverage is everywhere it's not easy for me test it but I'm scared without LineageOS actually getting on top of it and implementing the code it's not going to work. I'll test it once I go somewhere with no coverage but haven't had a chance yet.
rb1979 said:
Hi IronTechmonkey, at first I took it as a fact but later I thought about it and now I'm thinking how would WiFi calling work without LinageOS having code for it. Once you're outside of their network and T-Mobile (others too of course) can't get to your phone through SIM card the only way for anything to work is if the software on the phone through the internet first contacts the provider, correct me wrong but how would the provider get to you? This is just my thinking about it so I'm not sure but what common sense tells. I have the address on T-mobile and everything setup but since I'm not NJ where coverage is everywhere it's not easy for me test it but I'm scared without LineageOS actually getting on top of it and implementing the code it's not going to work. I'll test it once I go somewhere with no coverage but haven't had a chance yet.
Click to expand...
Click to collapse
Good question. I wasn't being quite clear enough in replying, and was speaking to whether or not there would be settings in the ROM if the feature exists, but was not speaking to whether or not the code is present. To the point of your question, from general web searching this seems to be device/ROM-build specific but when I search specifically for Lineage OS Osprey wifi-calling I find this thread. LOL. Apart from that this jira ticket for a different device is all I can find: https://jira.lineageos.org/browse/BUGBASH-508.
IronTechmonkey said:
Good question. I wasn't being quite clear enough in replying, and was speaking to whether or not there would be settings in the ROM if the feature exists, but was not speaking to whether or not the code is present. To the point of your question, from general web searching this seems to be device/ROM-build specific but when I search specifically for Lineage OS Osprey wifi-calling I find this conversations. LOL. Apart from that this jira ticket for a different device is all I can find: https://jira.lineageos.org/browse/BUGBASH-508.
Click to expand...
Click to collapse
Thanks, so I'm confused now, and thanks for your help. I know with VoLTE it was such a big deal we had whole posts about removing it and then bringing it back etc... all the updates and drama we need while nobody mentions even once if this device has wifi calling or not, haha, weird
I want to reopen this thread, I tried to ask in the official development opsrey thread but was sent to Q & A, so I'm reopening this thread. Anybody knows anything about Wi-Fi calling for osprey and LOS? Will it be implemented? Can I make a request somewhere? Maybe just switch to LOS 15 when it's official, will it have it on the arrival? I traveled outside of the US and did different tests and couldn't get Wi-Fi calling to work? Here's my post from the official osprey development thread with more detailed, thanks you, https://forum.xda-developers.com/showpost.php?p=73769962&postcount=5299
BTW, I made all necessary changes back in the USA with T-mobile to make Wi-Fi calling work, thanks.
So, WiFi Calling is unavailable as default option on any of ROMs for our devices.
BUT
For example, in Poland everybody who has Android higher than 4.1 can use "WiFi-calling" on "Orange" carrier. This carrier offers some application which realy works:
https://play.google.com/store/apps/details?id=pl.orange.vowifi&hl=pl
Functionality of this app is same, but i think it drains more battery than "wifi-calling" implemented as driver in kernel.
mrViZhy said:
So, WiFi Calling is unavailable as default option on any of ROMs for our devices.
BUT
For example, in Poland everybody who has Android higher than 4.1 can use "WiFi-calling" on "Orange" carrier. This carrier offers some application which realy works:
https://play.google.com/store/apps/details?id=pl.orange.vowifi&hl=pl
Functionality of this app is same, but i think it drains more battery than "wifi-calling" implemented as driver in kernel.
Click to expand...
Click to collapse
Thanks mrViZhy, actually I'm traveling from USA to Poland too. What I would like to do is keep the US number and receive text message (and pick up phone calls too) from US. I'm assuming your solution requires getting Orange number, if that's the case it would break the connection that I have with the US.
Thanks again for your help
I came from the OP3 and now have the 8gig/128gig and still using T-MOBILE. When I have my WiFi on, I'm able to make WiFi calls with no problems. But when I go out of range when on a wifi call it will just drop the call instead of handing it over to the carrier (T-Mobile). When I was using the OP3, and making WiFi calls, this would hand over with no issues.
Anyone showing the same behavior? Could this be a network problem or a device issue (that could be fixed with updates)?
Cheers!
Really? Am I the only one? No one has a comment/ideas?
My internet provider is AT&T, if that makes a difference, and I've tried the 2.4 and the 5.0 mhz channels, but it just won't change over to the more reliable source with out dropping the call.
Hi
I have a Oneplus 6 8G/128G, upgraded to 9.0.4 through the standard OTA channel. Since I changed my telephone operator, from Vodafone to Wind3, I'm experiencing loss of GPS signal during phone call. If I change my SIM and plug a TIM or VODAFONE one, and I still stay in the same cell area, the GPS signal is correct.
The only way to have GPS working during call, is to force the phone in 2G mode only. If I set 2G/3G or 2G/3G/4G the problem occurs.
So it seems that there is a interoperability problem between GPS and the GSM cell, but this is a bug of the phone: it I put my WIND3 SIM in a different brand phone, it works.
Is someone experiencing the same problem?
Thanks
Stefano
Yup, same problem here. I fear it's hardware. I've had the problem for all the latest beta versions of Oxygen OS
I experienced that it happens in some area and not in other area.. Here where I live it works well, while where I was last week not at all. It seems something related with LTE which tricks the firmware of the phone in some way. If they do not solve, I think I will change my phone...
My gps works ok if you are on 4g or 2g network, even in airplane mode. But if the network drops to 3g network the gps gets unstable, I realized this by taking a road trip.
I suggest you take this test
Yes, I can confirm that it works in airplane mode and in 2G 3G 4G mode when I'm in my home location. In some other places it does not work.
And so?
Same problem here, also with new 9.0.4 or the old version of os . I hope for fix. (forse conviene segnalarla sul forum ufficiale)
Problem has been solved: Oneplus sold and Galaxy Note 8 bought. So here is the end of my experience with this Oneplus which, in the end, cannot be used for professional purposes but only for playing...
Same problem with 6T McLaren
I have the same problem, during phone call gps signal is going away, if I put in airplane mode GPS is working wll, so it's not necessary tho have Mobil network or wifi. phone is updated to the latest version of Android 9 beta. Contacting the italian support team the say that it's correct to work in this way, because during phone call connection drop to h and gps nedd 3G or 4G for working, it's a crazy answer because in offline mode gps works correctly.
gmgunderground said:
I have the same problem, during phone call gps signal is going away, if I put in airplane mode GPS is working wll, so it's not necessary tho have Mobil network or wifi. phone is updated to the latest version of Android 9 beta. Contacting the italian support team the say that it's correct to work in this way, because during phone call connection drop to h and gps nedd 3G or 4G for working, it's a crazy answer because in offline mode gps works correctly.
Click to expand...
Click to collapse
I agree with you, this is a crazy and unacceptable answer. Unfortunately italian support teams are really bad in their job and with no technical skills (I have experienced the same with Samsung and Huawei service centers).
Anyway I think that there is a possible solution (at least with providers other than Wind-TRE): by enabling VoLTE in the service menu (https://forum.xda-developers.com/oneplus-6/how-to/guide-enable-volte-forcefully-activated-t3797538) some people reported that magically the GPS works correctly during phone call.
I was not able to let it work with my provider, Wind-TRE, because they have not VoLTE activated, but maybe if you have a different provider it worths a trial. I remember that when I had Vodafone as provider, the GPS always worked well and it started to fail once moved to Wind-TRE.
Let me know if it works!
After more tests I discovered that GPS signal is coming again after 4 minutes of call and continue to work, so this is a bug, no 4G or internet connection problem. Another problem is to contact OnePlus skilled support interface no one that admit that there is a problem, this is crazy!
Inviato dal mio ONEPLUS A6013 utilizzando Tapatalk