The messages, sent frequently at day and night, contain sensitive content and links with unclear origin.
Mobile users in recent months have been disturbed by messages from strange mobile phone numbers. The common characteristic of the messages is that they are sent with OTT apps instead of the traditional SMS mode. And the messages all are ads.
Experts said the biggest problem in dealing with these kind of messages is that they are sent under the mode of data messages. It is not easy for mobile network operators to filter the spam messages as they can do with SMS messages.
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