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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嚟自非聯絡人嘅 message 係會 mute 咗嘅。即使你無對方嘅手機號碼，你都可以將佢加去聯絡人入面。
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Tony Wong,
May 3, 2020 at 10:20