In most cases, if there is no backup, it is very difficult to restore deleted chat messages. The following are some possible methods and tools, but please note that the success rate and legality of these methods may vary from situation to situation： ### 1. **The recovery function that comes with the device** -**iOS device**: If you are using an iPhone and your chat history is made through apps such as iMessage or WhatsApp, you can try to restore the backup through iTunes or iCloud. But the premise is that you have turned on the automatic backup function before. -**Android devices**: Some Android devices may support recovering data from local backups, provided you have created a backup before. ### 2. **Third-party recovery tool** - **Dr. Fone-Data Recovery**: This is a popular data recovery tool that supports iOS and Android devices. It can scan your device and try to recover deleted chat history. -**iMobie PhoneRescue**: Another data recovery tool that supports iOS and Android, you can try to recover deleted chat messages. -**Tenorshare UltData**: Supports the recovery of multiple data types, including chat history. ### 3. **Contact application support** -If you are using WhatsApp, WeChat, Telegram and other applications, you can try to contact the customer service support of these applications to see if there is a way to recover the deleted chat history. However, most applications will not keep deleted chat records on the server side, so the chance of success is small. ### 4. **Legal channels** -If you think these chat records are very important to you and involve legal issues, you can consult a lawyer to see if you can ask the other party to provide this information through legal channels. ### 5. **Preventive measures** -**Regular backup**: In order to avoid similar problems in the future, it is recommended to back up your chat history regularly. Most chat apps provide backup capabilities, which can be backed up to the cloud or local devices. -**Use encrypted chat applications**: Some encrypted chat applications (such as Signal) provide message withdrawal capabilities, but they are usually retained on the server side for a period of time, which may increase the chance of recovery. ### Important note： -**Privacy and legality**: When trying to recover deleted chat history, be sure to pay attention to privacy and legality issues. Restoring or viewing other people's chat records without the consent of the other party may involve privacy violations and even be illegal. -**Success rate**: Even if a third-party tool is used, the success rate of recovering deleted chat history is not high, especially if the data has been overwritten or deleted for a long time. Hope this information is helpful to you! If you have more questions, you can always ask me.