Adrian's Dome said:
I've been grandfathering my unlimited data for years on a family plan with AT&T. Just did it again yesterday. I'm the only phone left, of four, that still has it.
Can't you just add a new line to your account and keep your plan?
I think what he's asking is if you can grandfather an individual plan into a family plan. To my knowledge, you cannot since it's a change of plan.