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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来自非联系人的通知将不会发出声音。您可以从用户的个人资料页将他加为联系人，而不用知道他的手机号码。
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Aoki Shinshi,
Aug 26, 2020 at 11:08