Spectrum Mobile is offering a $10 second-line option that adds a separate phone number to a compatible smartphone, according to plan summaries and carrier listings examined by this article on spectrum mobile.
The $10 second-line feature is described on third-party plan comparison pages as “Spectrum Mobile Second Line lets you add a second number to your compatible smartphone for just $10 a month.” This listing appears on the carrier plan overview used by shoppers comparing prices.

Spectrum’s own support pages confirm the carrier supports secondary lines and note that a secondary line “will use the same payment method as your primary line” and that charges for both lines “will appear on the same statement.” That language indicates the $10 add-on would be billed alongside a customer’s primary Spectrum account.

How the second-line feature works in practice depends on device compatibility. Spectrum’s customer support documentation and product pages explain that a “second line” can add a number to a compatible smartphone and that some second-line functions (for example, international day passes) are limited on secondary lines.
For shoppers, plan comparison pages list Spectrum Mobile’s core plans and note promotional pricing on some lines; the independent listings we opened show Spectrum Mobile plans starting around $30 for a primary line and identify the $10 option for adding a second number on the same device.
If you already have Spectrum Internet or a Spectrum account, these pages advise contacting Spectrum Mobile directly or signing in to the Spectrum account portal to view plan options and add a line, since billing and line management are handled through the customer’s Spectrum account.
Sources
- Spectrum — carrier plan pages and support documentation showing Spectrum Mobile plans and references to second/secondary line billing and feature limits.
- WhistleOut — plan comparison page that lists “Spectrum Mobile Second Line lets you add a second number to your compatible smartphone for just $10 a month.”











