[Samsung Galaxy S 5 Unified Development] curiousrom:
Network Data Not Working - MVNO UK - Bootloader & Modem

"...I use a virtual carrier which piggybacks on the O2 network in the UK." - That's probably one of the most important troubleshooting info. What not include the exact name of your Network provider? :confused:

From this reply to you SIM OK But Can't Make Calls:

...Modem & bootloader? Network provider?

...1- Check your network provider's recommended APN settings then double check > Settings > Network & internet > Mobile network > expand Advanced > scroll all the way down to > Access Point Names (APN)…

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You could screenshot and/or write down your working APN settings before rebooting.

Mobile Virtual Network Operator (MVNO) is marketing speak for a reseller of network services. It's not a real network provider.

Some of them block APN editing when they are provisioning the SIM & sometimes have a complicated APN setup.

Check LineageOS Wiki - How to submit a bug report & if done properly including a logcat & the correct working APN settings, some LineageOS dev may submit a patch for your mystery Network provider like you can see in these merged patches in the LineageOS Gerrit: branch:lineage-16.0 (status open OR status:merged) apn.

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How old is your SIM?

I am asking because on S3 i9300 LineageOS 14.1 for 2 weeks I could receive but not send SMS. Then I bought a Galaxy S5 SM-G900M & on LineageOS 15.1 official inserted that old SIM and still had the can't send SMS problem + was not getting LTE.

Went to my network provider's shop & got a new SIM & LTE appeared instantly on the status bar after booting it. And the SMS problem was solved.

Some network providers do not provision the SIM properly or block provisioning on custom firmwares.

The workarounds: insert your SIM in an other phone with stock firmware, send an SMS & wait for 10 minutes for provisioning. Or get a new SIM.

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Bootloader & Modem Confusion

"Are you sure that your not accidentally mixing up the word "Baseband" with the word "Bootloader"?" - Lol. I am 100% sure of what I wrote in S5 Odin Flashable Modem & Bootloader because I downloaded all the haggertk & other packages for which I included the bootloader & modem info in that post, unpacked them & checked their content & also included a list of what files are included & also a Odin screenshot after updating the bootloader & modem on my S5 & in that Odin log you can see what was installed.

As specified in that post: SM-G900V (G900V DQL1 modem.bin (2g & 3G), NON_HLOS.bin (LTE modem), rpm.mbn, sbl1.mbn, sdi.mbn & tz.mbn only. It does not include aboot (bootloader) so not to lock the bootloader if it was unlocked. How to check G900V bootloader status & how-to unlock link if necessary here).

That's the only exception, all the other packages including the ones with external links & not made by haggertk include aboot & the other firmware files.

Apologies accepted. :good: ;)

For those interested here is a technical article in LineageOS.org > Engineering > Qualcomm’s Chain of Trust with lots of technical details about the boot sequence.

For the Galaxy S5 check the MSM8974 boot sequence flow chart under the 2013-2016 Era chapter (attachment).

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[MENTION=4828250]Ibuprophen[/MENTION] - Maybe you missed it but you never replied to what I wrote to you here Re: G900V Shown as G900F? - G900V No Service Bug: