Seems like it is completely dependent on carrier. I purchased the s9+ unlocked from best buy. I was with Verzion at that time. A wifi calling setting was no where on the phone. There was also no visual voicemail. I made the switch to tmobile last week and as soon as i put the sim card in i got a wifi calling notification an the option is now there. I also have tmobile visual voicemail.
It might depend on your carrier - but on Verizon, that is one of the few features I do not have using the unlocked Galaxy phone on their network. If you don't have Verizon, you may want to reply to this thread with your carrier so someone else can chime in.
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This is absolutely insane. Why is this even an issue? Why do I have to buy the AT&T phone even though the hardware is identicle to the unlocked version? I just spoke with AT&T to complain about this issue and the rep informed me that this was not a problem at all with his unlocked Pixel 2 XL. He said the problem lies with Samsung's software. I don't know how true that is but I suspect both AT&T (or insert carrier here) and Samsung are both to blame. What a pain in the butt this has been.
