we used to be able to bill phones to our account a year or so ago and they got rid of it after so many years (been with them since 2002).. IMO they should of grandfathered customers who had the option and had their account in good standing.. it was convenient.. not sure if there was a time limit you had to pay the balance but i always paid it in full when i got the bill.
this option sound interesting, but i would guess there must be some catch.. how about those eligible for an upgrade, no phone discount? kind of sounds like you have to pay retail price..

haven't fully read the details yet, but it looks like you also have to return the old device when you upgrade?
btw, sprint has always had different class rating for each account. meaning they assign a rating to each account when it's opened. higher credit score meant you could have many lines and bill to account, those with lower score/class could only have 1 or 2 lines and no billing on account. i also believe after a certain amount of years they would increase your score if you paid your bill on time so you could get additional lines or maybe even get the bill-to account privileges.. i don't see how this can be that big a problem (people sending accounts into collections) more than they already do.