Webmay not be combinable with some offers or discounts. Get $700 off google pixel 8, 8 pro, 7, or 7 pro via 24 monthly bill credits when you purchase on a monthly. Webjust wondering if anybody knows a way to get the add a line discounts for existing customers. Currently on the tmobile one plan, with every phone on the plan completely. Add a new line of service on an eligible plan. Activate 2+ new lines of service on an eligible plan. Receive up to $700 back via. Webthe primary account holder needs to add them to the plan and then the primary account holder is responsible for the line. They can also apply for a tin (tax. Webi want to add them on my plan for unlimited date but they also want to upgrade and keep their number. How should i add them? He needs to port over to your account and you will be the new line owner if you're the pah. You’ve already checked off the two most challenging parts of adding a new line to your account: Identifying who you want to share.