If your friend wants to recover deleted chat records, there are a few key points to understand first: 1. **In-app recovery**: Many chat apps (such as WeChat, WhatsApp, etc.) usually back up chat records in the cloud. Your friend can check whether the backup function is turned on and try to recover the records from the cloud backup. 2. **Mobile data recovery tools**: There are some third-party data recovery software that can be used to try to recover deleted data. These tools can generally scan the phone storage and retrieve some deleted files, but the effect may not be ideal, and they should be used with caution to avoid further data loss. 3. **Legal and ethical issues**: Before trying to recover other people's chat records, you need to consider the legal and ethical boundaries. Accessing someone's private information without their consent may involve privacy violations, and the legal consequences vary from region to region. 4. **Seek communication**: Sometimes, the most direct and effective way is to have an open and honest communication with your roommate and ask the reasons behind their behavior, rather than probing through technical means. In short, it is technically possible to recover deleted chat records, but you should be cautious when it comes to privacy and ethical issues.