Yes...you can add a line of serv and get the iphone 4s for the 2 yr contract price....and then put the iphone on your number you already have. Then put a basic phone on the new line of serv. I am not big on adding a line of serv just to get a new phone, BUT, if you consider the new line of serv @ 9.99 plus taxes and surcharges..which prob will be about 14.00/mo and times that by two years....still comes out to less than paying full price for an iphone...its kinda like making payments...just my opinion...and the answer to your question of if it can be done....