Can the SMS deleted by OPPOa3 phone be restored in the business hall?

I'm sorry to hear that. You can try the following methods to deal with it:

1. If the cloud backup function has been turned on before deleting the notification/message in the "Info" APP of the mobile phone, enter "Settings"; Cloud service > machine backup > click Recover Data > Select this backup to try to recover the deleted notification/message.

2. If you don't turn on the cloud backup function before deleting the notifications/messages in the Info application, the deleted notifications/messages will not be retrieved.

Tips:

In order to avoid the inconvenience caused by data loss, it is recommended that you back up important data on your mobile phone regularly.

Due to different models and system versions, the operation path may be slightly different, please refer to the actual operation interface display of the mobile phone.

This answer applies to all OPPO models.