How do I deactivate the SMS Spam Filter? Updated July 19, 2018 12:07 Follow To deactivate this feature, visit your iPhone settings: 1. Tap on 'Messages' 2. SMS Filtering > Disable Truecaller. Related articles How is the ’Top spammers’ list built? Spam calls are not identified or blocked? How can I block them? How do i disable notifications from blocked calls or messages? Comments 0 comments Please sign in to leave a comment.