Hello. You will only be affecting your phone's plan. More than likely, this is the $10 premium data add-on which you may have not had before. Do you know what type of family plan you have? If you'd like me to take a look I'm more than happy to. You can private message me by clicking on my avatar. I will gather your Sprint account information in private.
Sprint Tech ~ Sprint.com Communities
Available ~ Friday, Saturday, Sunday
Check out a fun infographic that teaches you how to increase storage, enhance security, improve battery life and clean your device.