I have read on more than a few sites that wi-fi calling is not possible on a unlocked Huawei Mate 9 even with the T-mobile sim card. Does anyone know if this is true or is the Mate 9 not supported? From what I have read, the phones were purchased from Amazon and/or Best Buy. Does this make a difference? Appears to be a nice phone but I do need wi-fi calling because the office building I work in.

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