Unfortunately, that's promotional pricing for new users.
Some have had success in porting their number out of Visible to a new low cost carrier (Tello is frequently mentioned in the Visible subreddit) and then porting back into Visible to secure new customer promos - this requires using a different email address when establishing the new account. Be sure to acquire a customer referral code from the Savings Spot or somebody's user profile when signing up for the new Visible account.
While some have had success, others have experienced problems in maintaining their phone number across ports.
