Verizon may be trying to kill off all unlimited data plans even for "grandfathered" customers. This move will force existing and new customers to sign up for a tiered "data share" plan on its 4G LTE network.
These $30-a-month unlimited data plans may go through a forced upgrade to a new tiered system very soon. Certainly there may be legal ramifications for the company as a result of this proposed action. Although the company always stated that it reserved the right to change their policy in the future.
Last July, Verizon eliminated its unlimited data plan for smartphone users.
AT&T still has some unlimited data customers within their network on "grandfathered" plans. Their method to force these customers to switch was to slow down service to these specific customers--making the plan less attractive. Although an angry customer sued AT&T in small claims court and won. AT&T stopped the practice of slowing down service--with a few exceptions it seems. One exception being customers who exceed their data usage of 3GB per month.