Truecaller Chat will no longer be supported on iPhone for app versions 12.0 and above. Before you upgrade to the latest version, feel free to save your important conversations, photos, and videos. Please follow the options below.
Step 1: Photos and Videos
Long press on a photo or video and tap the download icon (as marked in red below)
Step 2: Chats
If you want to keep a copy of your most important chats, you can take screenshots and save to your Photos App. Learn how to take a screenshot with your iPhone: https://support.apple.com/en-gb/HT200289