Typically an unlocked Galaxy flagship will lose a couple features when compared to the same version carrier locked. In the case of the Galaxy S9 unlocked vs carrier locked, you would lose something like 1) voice over LTE (voice over LTE provides cleaner, clearer, sharper voice communication over LTE lines). Great feature where LTE is solid. 2) Visual voicemail or visual voicemail features like text to speach or speach to text. 3) OS and Security updates are much slower than carrier locked versions. But, like the other poster mentioned, we really don't know what is lost vs carrier locked until the phones are in hand. Last year I went with carrier unlocked S9. I lost VOLTE on Verizon, or maybe just Voice-over-WiFI (I just can't remember), and lost a feature in visual voicemail, but didn't lose visual voicemail. Updates were pathetic, months behind for security updates, but I love the unlocked freedom to move from carrier to carrier. I ordered unlocked again.
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