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 get a replacement SIM? How do I manage my Mint Family? Mint Kids Plan