How to retrieve previously received MMS pictures?

SMS and MMS cannot be recovered without backup, deletion and recovery after leaving the factory. If you are a Unicom user, because the content of SMS and MMS involves personal privacy, Unicom has no right to inquire. If you need to inquire about the details of SMS and MMS, you can log in to the mobile phone business hall of China Unicom, and click Service > Inquiry > Telephone Fee Business Inquiry > SMS and MMS details on the homepage to inquire about the details of SMS and MMS within six months (SMS and MMS details only provide the records of the last six months). The above path is subject to the information actually displayed on the query page.