The notifications appear when reception is lost and regained to cell towers. They do go away after the process is done. Some online sites are stating that carrier hub is from Sprint.
I recently installed the October system update. I noticed these in the apps manager. Carrier Hub, Carrier Device Manager, MCM Client and Mobile Installer.
It writes Carrier Hub, Processing Request to the notification log file in groups of five at different times in the day and night.
Aside from the permissions we're allowed to deny the all permissions gives it access to everything else on our phones. It's installed as a system app and is exempt from battery optimization, disable, uninstall, etc. On my S9 the notifications are set to visibllity private so I never see them in the notification panel. I found one of the apps or services that send one of the notifications in system settings, location, at the bottom of the page. Network Data Analytics. When I tap it a while screen opens and states it's disabled. Writes the notification log files every time.
So they've installed T-mobile /sprint software on my phone as a system app, it's not running properly and there's nothing that can be done with it. I really don't need more software collecting data for analytical purposes. They already have the T-mobile app, T-mobile pr adapt and another option that allows them to collect data for diagnostic analysis. I don't know if this was causing the recent battery usage to decline or not so I factory data reset and it's back to normal. The notifications are still being logged. This is not something I want on my phone.
Edit, A few things they might be used for on sprint branded phones. Mobile installer is used by sprint to automatically install apps, mostly apps we don't really want, on their branded phones. T-mobile has a similar app called app selector. Mcm client is sprint mobile content management. It updates everything a sprint branded phone has installed, apps, branding and features ect.
