How does Apple 5S search for deleted messages?

When two preconditions are met, deleted messages can be found by this method, as follows:

1. After deleting the short message, the program background of the "Information" column has not been closed;

2. After deleting the SMS, your iPhone has not been restarted;

Write a short message through iPhone4S: I love 9 1. Then send it to a test number.

After the SMS is successfully sent, return to the main interface and slide to the right to enter the search interface for search test.

Enter: I love 9 1 in the search interface. The text message with the words "I love 9 1" will be displayed. This allows searching without deleting short messages. What about after deleting the message?

The message has been deleted.

Then return to the search interface and search for the words "I love you". The search results show that you can still see the message "I love 9 1", and the results show that. Can you check this information? When you click on the message I love 9 1, you will jump to the SMS list page, but you can't see the details of the message. In this case, it is the caching problem mentioned above. However, when you click on this information and then return to search, you won't see the message that I love 9 1 in the search results interface. It is equivalent to the previous click that has refreshed the search results.

Summary of real machine test results:

The search function of iPhone can find these deleted messages because there is an uncleaned deleted message cache. When you refresh this information, it will no longer be displayed. In addition, even if you can see these deleted messages in the search results interface, it is impossible to open them. Clicking the search result will jump to the information list interface, so you can't see the details of the deleted message. If you want to query, you can only see part of the content on the search interface page.

How much privacy can this search function reveal? The results show that the amount of information leaked is very small. Quitting the information background program or restarting the iPhone can prevent the deleted information from being found; Or it will automatically clean up the relevant cache information after a long time, but how long it takes for this automatic cleaning function remains to be further tested and confirmed.