I made the changes.
But make sure you do your research on your data usage, but beware to check your bill and monitor it.
I changed it and they added 40 bucks to each line when I was quoted with a certain amount.. 5 lines for 170. And my AT&T bill was ridiculous high than what I expected.
On the 10GB and higher mobile share plans, If you've upgraded your phones after 2/1, the line associated with that phone will be $40 per month. If you upgraded your phone(s) on 2/1 or before, the lines will be $15 per month.
If it is anything other than that, AT&T has messed something up on your account.