Your friend's roommate frequently deletes chat history, which may indeed cause some doubts. Regarding whether these records can be restored by technical means, the following are some factors to consider： ### 1. **Feasibility of technical means** -**Recover deleted chat history**: In some cases, deleted chat history can be recovered, especially if it is deleted in a short period of time and there is no in-depth cleanup. Some professional data recovery software or services may be able to help recover some or all deleted chat records. -**Mobile phone backup**: If the other party has turned on the mobile phone backup function (such as iCloud, Google Drive, etc.), the deleted chat history may be retained in the backup. By restoring the backup, you may be able to view the previous chat history. -**Third-party apps**: Some third-party apps may claim to be able to recover deleted chat history, but caution is required when using these apps because they may involve the risk of privacy leakage or malware. ### 2. **Legal and ethical issues** -**Privacy**: It is a violation of privacy to restore or view other people's chat history without the consent of others. For whatever reason, this kind of behavior is legally and morally undesirable. -**Trust issues**: If your friend suspects that her roommate is hiding something, the best way is to communicate directly, not through technical means to obtain information. Trust is the foundation of roommate relationships, and any form of snooping can destroy this trust. ### 3. **Communication and understanding** -**Direct communication**: It is recommended that your friend communicate honestly with her roommate to express her doubts and feelings. Maybe roommates delete chat history for other reasons, such as protecting privacy, cleaning up phone memory, etc., but not necessarily hiding something. -**Build trust**: Through communication, both parties can better understand each other's needs and boundaries, thereby establishing a healthier roommate relationship. ### 4. **Seek professional help** -**Psychological counseling**: If your friend is extremely upset or troubled by your roommate's behavior, it may be a better choice to seek the help of a counselor. A counselor can help her deal with her emotions and provide effective coping strategies. ### Summary Although technical means may restore deleted chat records to some extent, this method may not only involve legal and ethical issues, but may also destroy the trust between roommates. It is recommended that your friend solve the problem through direct communication, or seek professional help if necessary. Maintaining respect and understanding is the key to dealing with such issues.