SimpleChoice add a line question

Hey Ya'll,

Wanted to ask, I've got a SC plan that i'm attempting to add another line to. The option for this cost $25 and is labelled as "Simple Choice North America Plan: Unlimited Talk + Text Plan".

Question is: What about data? Is it included or do I need to add a data "pack" later on?

Additional question: While searching for the above information, I realized TMO has actually grandfather unlimited highspeed data to all the SC people and thus we don't need to be paying for the "Unlimited High-Speed Included w/ 6GB Mobile Hotspot" for $12.75/month. Is this true?

TIA!