I currently have a no-tab BYOD plan. I do however have a $40/month no-tab plan. I want to take advantage of a current offer on a phone, $0 upfront on a small tab (then $240 on tab, $10/month). But in the details of the offer it says "Must upgrade on a tab to redeem this offer". Does that mean I have to change my plan? Or do I keep my current plan, since I am paying $40/month, and just pay the tab charge extra per month? I would like to know before I place an order for the phone because its an online only offer. Thank you. (I plan to pay the tab off after 90 days, so would like to not have to change plans, and then change plans again when tab is paid off).