Notifications from people that are not your contacts will appear without sound. You can add users to contacts from their profile without knowing their phone number from their profile.
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來自非聯絡人的訊息將會設為靜音。即使您沒有對方的手機號碼，您也可以將用户新增到聯絡人中。
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Tony Wong,
May 3, 2020 at 10:21