Final answer:
The cost to add a line to a mobile phone plan varies depending on the carrier and plan. Benefits include sharing data and minutes, discounts on multiple lines, and promotional offers. The maximum number of lines on a plan varies, but most carriers offer family plans with up to 10 lines.
Step-by-step explanation:
The cost to add a line to a mobile phone plan will vary depending on the carrier and the specific plan. Generally, adding a line to a family plan can cost around $20 to $40 per month, but this can vary.
The benefits of adding a line include:
- Sharing data and minutes with family members
- Getting discounts on multiple lines
- Being able to take advantage of promotional offers, such as free or discounted phones
The maximum number of lines you can have on a mobile phone plan will also vary depending on the carrier and the specifics of the plan. Most carriers offer family plans with up to 10 lines, but some may offer even more.