All phones can upgrade with Easypay anytime.... You have to wait 20 months to get a true subsidized upgrade... In my case of 5 lines, 1 of those lines was way past the 20 month period thus by the rules the whole account could change to the new rate plan at $15.. If all your phones got a subsidized upgrade during the last 20 months, then the only way to kick your account into the new rate plan is to add a line... BTW,,,, that line can be added using an old phone you have or you can get a cheap older phone... That's why I had my son-in-law run out yesterday and update his Iphone to a 5S under the wire....
• One phone on your account was purchased on Sprint Easy Pay
• One line is no longer under a one or two-year term agreement
• One line is upgrade-eligible on your account and upgrading to a new device on your account.... this got me my change
• By adding a new line of service to these plans on your account
• Note: The line meeting one of the above conditions must switch to Family Share Pack or $60 Unlimited plan for other lines on the account to be eligible to switch.