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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来自非联系人的消息通知不会产生声音提醒，在不知对方号码的情况下，您也可以在对方主页上将其添加为联系人。
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Monster,
May 20, 2020 at 04:12