Check out this page: https://www.visible.com/get/3B3NHDG, it has all the info you need to know about joining Visible. When you use my friend code, 3B3NHDG, you’ll get your first month of service for only $5!
There's actually no limit to referral codes. Technically it does max out at 12 months but as long as people are added, you'll stay at the 12 month limit... I've been at the max and paying $5 a month since May of 2021