How do I add a line to my Mint Mobile account? You can add a line to your existing Mint Mobile account by creating a Mint Family. You only need two lines to create a Mint Family, which allows one Primary account holder to manage multiple lines (max of five) under one Mint Mobile account. To get started on adding a line to your Mint Mobile account, check out our step-by-step guide on how to create a Mint Family. Notice: JavaScript is required for this content. RELATED ARTICLES How do I set up and manage two-factor authentication? How do I check how much Mint data I've used? How do I contact Mint Mobile?