Does 45 day waiting period for Global Travel pass apply to new accounts or new lines?

I've been with Xfinity now for 45 days and also looking to bring my daughter over to the Premium Unlimited plan.  She is currently in the UK and will be there for the next two years.  This plan is right for us but I'm wondering if the 45 day waiting period to use international data voice applies to NEW LINES or NEW ACCOUNTS?  It would be a shame to move her from AT&T and not be able to use the phone for 45 days.  If this rule only applies to new accounts, we should be ok.  But if it applies to new lines, I'm not sure we want to go 45 days without cell service.  THanks for answering my question.