I recently added my iPad to my AT&T mobile share plan, which required adding a line for the iPad...there is a number assigned to the iPad even though it's never used. Interestingly, when I check my eligibility on AT&T this number shows up too and says a two-year upgrade is available. If I bought the phone at upgrade pricing on this line, would they make me pay for two iPhones? or could I just activate it on my iPhone line? xxx-xxx-xxxx is eligible for a discounted upgrade. This line is eligible for equipment discount pricing when you sign up for a 2-year service agreement. You can also take advantage of our no-commitment pricing option.