How much does it cost to add a line to a family plan on T-Mobile?

David R

New member
We have a family plan and I'm a 11 year old kid.
I want my parents to add a line for me.
So with the new Kids Free till' 2012 thing will adding the line be free?
Also how many lines can we add for free because my parents want to add one for me and my brother.
 
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