Can the short interest records from 15 years ago be retrieved?

No. According to the information on the official website of Telecom, the communication company will retain the information service for 3 years, and the system will automatically clear it after 3 years, so the text message records from 15 years ago cannot be retrieved. The text message record is an important credential so that users can view the content and prevent the other party from denying rogue behavior.