OneUI 5: Data Roaming Popup

[dbGHOST]

After upgrading to OneUI 5, every time there's a network change (even switching between 4G/5G) the data roaming dialog pops up.

If I have roaming off, it suggests me to turn it on; and if I have roaming on, it suggests me to turn it off.

The popup has two options: cancel and settings (which brings me to the roaming settings). It displays on top of everything and I couldn't do anything until I dismiss it. If multiple network changes happen the popups also display on top of another, and I have to dismiss one by one. 

It's particular annoying during driving, as the popup also forces minimizing the navigation app. So I have to dismiss the popup (often multiple times) then bring the navigation up again, quite dangerous to do on highway.

After some digging I find the source of the popup is Call settings:

com.samsung.android.app.telephonyui

And a suspicious activity is:

com.samsung.android.app.telephonyui.carrierui.networkui.app.TmoDataRoamDialogActivity

(Yes I'm using T-Mobile)

There's also a receiver called:

com.samsung.android.app.telephonyui.carrierui.networkui.app.RoamingGuardReceiver

Is there any way to make it stop?

Already tried disabling the activity using pm disable/disable-user, throws security exception (due to sys app?)

[Monkey D Luffy]

Hello,

You can try this method to solve it.

Check your roaming settings.

Mode: Set to auto mode and Settings will be all should be checked and Guard will No Checks.

First, turn off data roaming and see if the pop-up disappears or not, if not then turn it on back and do a restart, then check if it’s fixed or not.

Another method, reset the network settings on your phone.

Hope this helps.

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[dbGHOST]

Not sure which mode you are referring to.
In Settings - Connections - Mobile networks I only have 1 Data roaming option, either on or off. No mode/guard option.
As I already mentioned in the post, if I turn off data roaming, the popup suggests me to turn it on.
Resetting network settings does not help.

[dbGHOST]

Actually found a really odd behavior.
No matter what I set on data roaming toggle (on/off), ALL mobile data I used was counted as roaming data in settings. It only kept 6 months of records so I can confirm this behavior since at least July.
Checked with T-Mobile and the roaming usage was fine. Not sure how Samsung messed that up.

Honestly I'm so disappointed by Samsung's code quality in recent years.
Completely bricked my Watch4C with faulty firmware.
Added country lock to "call & text on other devices" then never bother checking what SIM I'm using. It simply disables itself as long as I have a SIM from another country inserted (even disabled).
Added Astro mode to ExpertRaw and didn't realize resolutions other than 1080p existed.
Promised eSIM didn't arrive until years later.
Can't even make the shopping cart work on official website. Either discount doesn't apply (happened to my friend's Buds twice) or something's out of stock during checkout, and they simply remove the item from the order but keep charging you. (I still have screenshots and chat history from my S21U order).
...
Seriously?

And they don't even accept error/bug reports. Every time there's this automatic reply asking for more logs, **bleep**, you've already collected the logs for days, drained my battery several times and used hundreds of MBs of data to send logs, how many more do you want?

[dbGHOST]

So I actually found the issue. It's hilariously simple and basically shows Samsung US's 0 knowledge on handling dual SIMs.
With the current implementation, as long as a SIM is roaming, all SIMs on the device will be treated as roaming, so does all the data used. Thus even when the data SIM is not roaming, I still get the popups every time there's a network change.
Tbh the popup is quite dumb anyway. If I have the toggle on then I absolutely want it to be that way. 1 popup reminds me, sure; 2 popups every time? What's your problem?
Now I'm getting 4 popups every time entering/leaving an elevator/garage, 10 popups on average every time I drive, clearly too many.

[dbGHOST]

Also in case you wonder, yes, I reported this issue and the call&text on other devices issue multiple times, and they simply replied "cannot reproduce the issue"