51CTO column Li Yang talks about the technical reasons for text message loss of Android devices

Many Android mobile phone users may lose their text messages inexplicably. Many people do not understand why it is lost? This article will explore the reasons and hope to help users.

Type 1 reason: storage reason

1.1 An error occurred while running the SQLite database managed by Android.

Android manages SMS messages through SQLite, and all SMS messages are stored in the corresponding database. The storage path is usually dbdata/databases/com. android. providers. telephony/(different Android systems may have minor differences) mmssms. db database, which maintains nearly 20 tables, of which text messages are stored in the sms table. Therefore, if the database fails or is deleted (the mobile phone does not have the root permission to read or delete the database), all text messages will be lost.

1.2 storage medium faults

Android mobile phone storage (Flash storage) is the default physical storage medium for text messages. If mobile phone storage fails, text messages may be lost. Similarly, if you set the text message to be stored on the SD card, if the SD card fails, the text message may also be lost.

Second reason: Application reason

2.1 An error occurred while operating the SMS Application

There are many Android apps that operate on text messages, such as Go text messages and super text messages, which can help users perform text message operations. Therefore, you have the permission to delete text messages stored on mobile phone storage media. If these software cannot be performed unexpectedly (not by the user) to delete the SMS, the SMS may also be lost.

Category 3: stability of the Android System

Tens of thousands of search results show that the Android mobile phone is unstable, such as text message loss after the phone restarts unexpectedly. This is caused by the stability of the Android system. You can upgrade the latest Android version and regularly back up text messages and data to avoid data loss caused by system instability.

Category 4: configuration and operation reasons

4.1 text message deletion settings

Android mobile phones can set text messages on mobile phones, and the setting threshold is exceeded in a session (short message sender-receiver's Short Message Communication is called a session, the system will delete the text message that has been retained for the longest time in the session to ensure that it does not exceed the threshold. After testing, such deletion is not batch, but one by one. If a user sends 200 messages when the number of messages reaches the threshold of 201st, Android automatically deletes 1st messages of the session. The specific operation method is: information-> Settings-> storage settings-> Settings to delete the old SMS, SMS restrictions, and MMS restrictions.

4.2 restore factory settings

Restoring the factory settings of the Android mobile phone may also cause loss of text messages, applications, and other data. The specific operation method is: Application-> Settings-> privacy-> Resume appearance settings.

4.3 misoperations

Android supports batch deletion of text messages. Users may accidentally delete all text messages due to misoperations. The procedure is as follows: info> Settings> Delete session.