How do I become a Professional user? Updated September 19, 2017 19:46 Follow Open Truecaller. 1. Tap on 'More' > Upgrade to Professional, and then follow the steps in the wizard. Related articles Why can’t I see all my missed or incoming calls in my call history? Why should I use Truecaller to dial instead of the normal phone app? How does Caller ID on iOS work? How can I connect/disconnect Facebook in my profile? What is T9 search on iPhone? Comments 0 comments Article is closed for comments.