How to get the usage period of premium offline database by inviting friends to join Whoscall?

Invite new user to install Whoscall (Android version). Both your friend and you can get extra 30 days usage period of premium offline database. Steps:

1. Find "Invite friends" in drawer.
2. Share Whoscall to friends with your referral code.
3. Once your friend redeem your code, both of you will get the reward.

* You can accumulate up to 360 days of usage period. New invitations will not be counted when you reach the limit.