samsung smartphone having exynos 7 octa processor or above including mid range phone supports 2CA feature. but some user are confusing why 4G+ icon is not showing in status bar. it is because of software update but it doent mean ur smartphone not supporting CA feature. If u want to check whether ur phone supporting CA feature or not..u can use netmonster app from google play. which will clear your doubt. this application will show you real time frequency band of ur network operator.
it gives information according to processor, not device.
while only A series phone on Exynos 9611 support 4G+ but not M series.
Even I got this false hope because companies don't mention about it in specific, & these false app like netmonster or website like gsmarena.
gsmArena showed 4G+ in Redmi note 4, note 5 & note 5 Pro back in 2017, but none of those devices have that feature till date.
Now it is like a trend of mis guiding customers.