Why can't some short messages be intercepted?

Some messages could not be blocked because:

1, the method of intercepting short messages mainly depends on "keyword" retrieval.

The security system filters the content of short messages. If the short message contains sensitive words such as "winning the prize" and "making a phone call", it is considered as spam and will be automatically intercepted.

2. However, criminals often use some means to bypass filtering, such as inserting symbols in the middle and applying typos.

At the same time, due to legal problems, many security systems can only intercept these short messages and mark them as spam messages, and have no right to delete them directly.

According to the "20 16 China pseudo base station short message research report" released by 360 mobile guards, in March this year alone, 360 mobile guards * * * intercepted all kinds of pseudo base station short messages 1. 1 100 million messages for users all over the country, with an average of 3.548 million messages intercepted every day. Common spam messages are generally sent by pseudo base stations.

For example, many short messages from pseudo base stations will induce users to click on the websites in the short messages, and these websites generally carry Trojan virus. Once clicked, criminals are likely to master the information on the mobile phone and conduct subsequent fraud activities.

The so-called pseudo base station is a radio transmitter disguised as an operator base station. It uses the advantage of high local power to interfere and shield the communication signals of operators, and then masquerades as the operator's network, allowing users' mobile phones to connect to their own networks to achieve the purpose of sending short messages.