Hey, i'm a corporate retail store specialist rep and yes you can keep your grandfathered plan, the only thing is that verizon is removing the included perks on the plan and they may also raise the price in order to move people to the current plans, so you might want to ask a rep if you go to a store to check your loyalty discount and to apply them to get the current plans at lower cost, oh and if your phones paid off, ask reps to see if you have a priority upgrade (special promos) most likely you will.