When the phone was available through T-Mo previously, it would run you a hefty $630 without a contract. Now if you'd like to get your hands on the device, it will only run you $499.92 off-contract, or $20.83 per month over a 24-month span. This price drop likely has a lot to do with Sony's recent announcement of the Xperia Z4 – an iterative take on last year's flagship.