thanks.. and how would this affect my current plan? I just have one line with unlimited data
Your situation is a little different. With only one line, in order to add another you will have to switch to a family plan (not shared data plan). The minimum minutes for a family plan is 550 minutes for $50.00 for the primary line and then $9.99 for the second line. You could still keep your unlimited data for $30 and unlimited texting for $20. So your monthly total would technically go up $20.