To enable SMS Filtering on iPhone, please select Truecaller from iPhone Settings > Messages > Unknown & Spam > Truecaller
Once enabled, Truecaller will filter you messages into Transactions, Promotions & Junk.
This feature works only in the following countries:
United Arab Emirates
United States of America
If you enable SMS Filtering and are not in one of the above countries, the SMS might incorrectly classified as Junk.