Some users report success by simply emailing support via the app. If you have a clear profile (verified, photos uploaded, bio filled out), you can ask: "I am considering subscribing, but I would like to test the 'Who Liked Me' feature first. Do you offer a 3-day trial?" Support sometimes grants these manually to convert you into a paying user.
This is the "cheat code" of the trial. Free users have to swipe blindly. VIP users can see a grid of everyone who has already swiped right on their profile. Instead of playing the guessing game, you can go directly to your "Admirers" list and match instantly. 3fun Vip Free Trial
While the 3Fun VIP Free Trial is legitimate, it is designed to convert free users into paying subscribers. You must be aware of the auto-renewal trap. Some users report success by simply emailing support