Whether it is possible to recover deleted chats depends on a variety of factors, including the model of your phone, operating system, chat application, and data backup. Here are some possible ways: 1. **Cloud backup recovery**: - If the chat application (such as WeChat, WhatsApp) has cloud backup enabled, you can restore the deleted chats by restoring the backup. Please note that this usually only restores to the state of the last backup. 2. **Local backup recovery**: - Check if there is a local backup (such as iTunes, Google Drive) that can be used for recovery. Some applications allow users to back up chats to a local device or computer regularly. 3. **Professional data recovery software**: - Some data recovery software claims to be able to scan the phone storage and recover deleted data. However, the success rate of this method is not high, especially after the data has been overwritten. 4. **Professional data recovery service**: - If it is very important, you can consider contacting a professional data recovery service company. However, this is usually expensive and there is no guarantee of success. It should be noted that snooping into the privacy of others is generally not allowed morally and legally. Before taking any technical measures against your friend's roommate, it is recommended to respect the other party's privacy and consider understanding the situation through direct communication. At the same time, restoring data on other people's devices may require the other party's authorization, otherwise it may involve legal risks.