You can with quick access send flash messages by tapping on the icon anywhere in Truecaller.
The flash message will ping you for 60 seconds then leave a short message in the notification tray which you can tap on to read and reply later.
You can see your flash history in your call log -> 3-dot menu -> Flash. Note, you cannot read the messages later on.
Send pictures through a flash message
Flash message screen
Chat quickly with friends and family
Share your location. Tap on the address to open the GPS