$540 via promo credit when you add a new smartphone line with your own 4G/5G smartphone on postpaid Unlimited Plus plan between 5/18/23 - 5/31/23 & port-in req'd. Promo credit applied over 36 months; promo credits end if eligibility requirements are no longer met.
is it possible to use a portable phone jack (that you plug into a wall) to use verizon phone service?
I am not sure I understand what you are talking about. Portable phones do work with the Verizon Phone service.