Last Updated: Nov 16, 2013
You are not charged to download and install Sprint ID Packs. However, some premium applications within the ID Packs may contain a monthly recurring charge. If this is the case, you will be notified of the associated monthly charge when you sign up for the application, similar to any other Android Market application.
Phones that support Sprint ID already require a bundled voice/data plan, so any associated data costs should be covered by your existing plan.