Travel Sim use changes with PIE update? - Samsung Galaxy S8+ Questions & Answers

Currently on Oreo...
I recall reading somewhere a change has been implemented in Pie with respect to Travel Sim use; it is now necessary to re-flash a new rom before new travel sim card can be used in a different country, is that correct?
Anyone know what the process is with respect to getting a pie flashed phone working with a new destination country sim card?

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Z3 sony sol 26 not showing any unlocking menu

i have a sol26 for unlocking,i have got the codes for it through online server but i dont know how to enter the code, when i insert the sim card it just says no service and not showing any unlocking menu
Before making any manipulations in Flashtool be sure that "Unknown sources" is allowed in Security and "USB debugging" is on in Developer menu. Be sure that connection with PC is stable (USB is quite fragile on Xperia devices esp. with time, when flashing anything never interrupt connection) and the PC is always trusted on phone after USB connect.
In the Flashtool Xperifirm download same firmware that you have now (KDDI) but only for Docomo carrier Z3 version phone and install this completely. The last one is Lollipop 5.0.2 (if you are on Kitkat - you can upgrade by installing first KDDI 23.1.G.2.244-Lollipop 5.0.2). Before installing i recommend reset and erase all on device to factory setting. After you install Docomo version put the sim card and unlocking menu appears. I recommend using only Japanese OS versions - because you don't loosing the 32Gb storage, on european version the storage is only 16Gb.
After successful code unlocking the phone function will be open completely forever - so you can even return on KDDI (Au) firmware back and not loosing sim unlock. I personally returned because there's specific japanese neat features which is missing on Docomo version - 1) no Private manager in Security, 2) no Accelerated GPS by Qualcomm in Location and others specific things. Take out sim card and just install downloaded KDDI Lollipop, after all done put sim inside. There's quite serious difference between Docomo & KDDI in phone function - esp. turning off LTE or other data-hungry, it's harder to change 3G to 2G on KDDI - you will need to do that manually in network preference (on Docomo it's much easily in menu).
I think you can easily safe sim unlock and install here a european Android 6 version which is latest, but you will loose 32Gb storage to the 16Gb and there will be no more specific japanese features like Accelerated GPS - which very very very helping with speed of GPS determination (almost on iPhone level, i tested - without it the GPS works much slower).
If you on Kit-kat beware that this all will upgrade you to Lollipop where's no specific KDDI "Face unlock" function anymore, it's deleted in 5.0.2. I want to even return on Kit kat but can't find old firmware file anymore anywhere - the 23.0.C.0.350, i think you can save sim unlock even there, but without Docomo you can't unlock sim and the Docomo is only Lollipop too.
I used Flashtool 0.9.22.3 on Win 7.
So, i've tried a different firmwares after unlock.
The KDDI (au) which is most rich by features are not really usable because of fixed number prefix with calling every time. The sim card is recognized, it's ok, but the phone putting a prefix to every number you calling. How to remove that prefix i don't really know, no settings for that, maybe it's need to be rooted and manually do something with code.
there's other models of compatible Z3 firmwares with 32Gb storage:
D6616-USA old
D6646-USA Marshmallow 6.0.1
D6708-USA old
401SO-Japan Android 5.1.1
• 23.1.G.2.244 KDDI 5.0.2 - everything work except call - fixed number prefix. Even step counter works, from version 5 new charging optimization function like in all other Sony smartphones.
• same 5.0.2 Docomo - everything work, call is ok, but no special features like in KDDI, no privacy app manager, no Qualcomm express GPS.
• 23.0.C.0.350 KDDI 4.4.4 - same problem with call prefix, very good battery 8 days.
• 23.5.A.1.291 USA D6646 - 32Gb, NFC not working not tuned for japanese version, Call is ok (everything), GPS is very good & fast, Free Navigon automobile navigation app coming only with this firmware for all Z3 users (it works), step counter not working (Google Fit), bad battery showing - only 3-4 days, for multi-tasking need a root and little code changing (the function to use 2 app windows together is present here in developer but turned off by standard)
I'm not sure yet, but if battery will be really bad on 6.0.1 i will try 5.1.1 for 401SO model, where i think that NFC can work.
I deleted Marshmallow, too bad battery, only 3 days on one charge.
I was a fool, the 401SO firmware is also Lollipop 5.0.2, flashed normally but with some dancing of downgrading flashtool, it don't see this ftf even if you put it right, with flashtool back to version 0.9.20.
So, the only 5.1.1 for Z3 with 32Gb is only USA Verizon for D6708, but it's not flashing at all, some error with partition or etc. (i downloaded it by flashtool from Xprefirm).
There's a cumbersome method on japanese site to obtain OTA update for Docomo Lollipop to the Marshmallow, i'm too lazy to test it with all IMEI masking and etc. Standalone Docomo Lollipop even with unlocked SIM are not getting OTA update at all.
Other method which promised also root much easier and i'll try it - it's by putting on top of Docomo version the D6603 Global but with only kernel and system (appslog, cache, data wiped), so flashing 23.0.B.1.59 with 23.0.A.2.93. Not sure about result, but looks interesting.
Nah, i've flashed Developer Preview Nougat 7.0, the last one. Working quite good, sim unlock and phone works perfectly. The battery is good, people complained that it's bugged, i've noticed only like 2-3, the NFC not working here and storage only 16Gb, i want to test battery here, very good battery during screen off with that "Doze" function than Marshmallow like not spending a percent at all.
The Music app from Sony even installs here by Google store and it works, even equalizer work, no clear+, but with bass and surround.

[HELP] Problem with dual-sim firmware

Hello everybody!
I'm a user of Lenovo A536, and soon i decided to customize it. So i wanted firstly to install fresh version of stock. My phone is single SIM version, and after few hours of googling it looks like there is not singe SIM version firmware available for download. I tried about 5 different versions(last digits of releases):
*910
*725
*141115
*813
and maybe one more... And all is Dual-SIM.
After installing DS Stock ROM, everything seems OK, but, there is network issue. I'm available to use just GSM(2G) networks. My default SIM is SIM 2, not SIM 1 where WCDMA(3G) is setted by default. (Why is this really important to me: most of a day, i'm not at home, so slow network is like i don't have it. ) In SIM Managment there is no another SIM. Just SIM 2, and when i click on it, there is two options, SIM 2 and "off".
What have i tried more:
CODES
I have tried to dial *#*#4636#*#* but, i got two phone infos(Phone info 1 and Phone info 2) and "radio off" is not working as changing mode, on both of it.
Build.prop
I have looked what is seeking there... I saw option something like "...active.sim..." and it has value of 2, and i set that to 1, but that caused bootloop after rebooting....
APPS
I have downloaded some SIM Managers and try to enable/disable SIM 1, and to set 3G to SIM 2, but that was unsuccessful also.
Is there any way to change some system file which contains these settings, to disable one SIM, or just to change SIM 2 to SIM 1?
Or can you find correct singe SIM ROM?
I'm currently on MIUI 8.
Thanks to everyone for attention.
(I'm sorry to MODS if i have posted this thread on wrong place, or named it incorrectly)

Any Android 10 custom ROMs supporting dual SIM toggle/select?

Before I attempt to install an Android 10 based custom ROM on my phone, I would like to know if any of them support independent toggling of the SIM cards? For instance, can I toggle SIM 1 to be off/disabled while leaving SIM 2 on/enabled? Looking forward in any suggestions. I'm leaning toward trying out Havoc, but before I go through the process of installing, I'd really like to know if the SIMs are independently selectable.
Cheers!

How is VoLTE implemented in Android nowadays?

Hello,
I used iOS the last years but want to switch back to Android/customs roms. A few years ago, when VoLTE started to become available, I remember that it generally only worked on android when the phone had the carrier firmware.
A few days ago, I tried an unlocked phone with a non carrier firmware with my sim card, and volte and vowifi worked immediately. I cannot find any information how this is implemented nowadays. Is there any relation with Google carrier services? Or do modem basebands include these settings? Where is this information stored and does volte and vowifi on newer android systems "just work" as long as the carrier supports it? I'm just curious how it works, and if LineageOS for example does support it.
Thank you!

CalyxOS - Pixel 4a - network issues

Installed CalyxOS on Pixel 4a. Very easy install.
Now have internet access through Wifi only. Can make phone calls (Sprint network) but no internet.
Anyone willing to help or redirect to source of CalyxOS support? Doesn't appear to be much online support.
Doesn't seem to be a lot of traffic on this forum.
In case anyone is interested, conclusion on Reddit forum is that my Sprint sim card may be the problem with CalyxOS. Wish I would have known this before suffering through the install and then return to stock.
All I am really trying to do is find an alternative to stock unrooted phone so I can better manage various things as I have done with all of my previous android phones. First attempt using rooted Android 11 was successful. Unfortunately both Adaway and Titanium BU failed to function. So now back to unlocked unrooted Android 11.
Also have the same phone and issue with trackphon.
@CarlInMO All Sprint users who don't automatically switch to T-Mobile are not currently able to use CalyxOS (or GrapheneOS or similar) until T-Mobile allows open network Pixel phones to use a service called TNX. TNX will allow Sprint phones to use T-Mobile SIMs or eSIMs.
You can read more here:
PSA: Does not work with Sprint ESIM : r/CalyxOS
Just wanted to let everyone know. I tried to activate it via the chat and it wouldn't even download the sim. Switched ba
teddit.net
asuh said:
@CarlInMO All Sprint users who don't automatically switch to T-Mobile are not currently able to use CalyxOS (or GrapheneOS or similar) until T-Mobile allows open network Pixel phones to use a service called TNX. TNX will allow Sprint phones to use T-Mobile SIMs or eSIMs.
You can read more here:
PSA: Does not work with Sprint ESIM : r/CalyxOS
Just wanted to let everyone know. I tried to activate it via the chat and it wouldn't even download the sim. Switched ba
teddit.net
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I don't know what's going on but I've been having problems just trying to get signal once I put my metropcs card in my pixel 4a

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