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It’s a fantastic phone, definitely the best S ever made but the Unlocked model [SM-S901U1] doesn’t allow for carrier aggregation.
That doesn’t fit with international carriers that take advantage of multiple bands to ensure the best connection and speeds possible over a specific network.
It’s absurd that a phone from 2022 only works with a single band. The Exynos variant allows for carrier aggregation, the 8 Gen 1 sold in US does not.