An old deprecated plan means that there has been a newer plan for this product for some time. Deprecated plans do not receive the updated features. These plans show as red color in your online iPlum portal. You can update to latest equivalent plan. Latest pricing plans are available online in pricing section.
When you upgrade a plan it will charge you only the difference of new & old deprecated plan for the term left on the plan. It will not start a new term.
Example: If you have $7.99 annual old deprecated plan which you update to latest $8.99 annual plan, it will only charge you a $1/month for the remaining months of the plan. It will not charge you from the beginning of the term.