Why didn't the SMS for recharging the mobile phone card and checking the balance be deleted, and it disappeared automatically the next day?

Make sure you and others haven't deleted it. It may be that some data stored in the mobile phone was lost when it was disturbed greatly. It may also be that your phone's memory is full and you can't save it. The phone system automatically deleted these.

Solution.

1. Check whether the "Delete old information" setting is on: Information-More-Settings-More Settings-Delete old information-Off (the operation path of different models of mobile phones may be slightly different).

2. If it has been turned off, please check whether the third-party SMS software is installed in the mobile phone and check whether there are relevant settings.

3. If the mobile phone still automatically deletes the SMS, please back up the data (contacts, information, photos, etc. ) and try to restore the machine to factory settings.