If T-Mobile’s goal is to get the wireless industry to ditch two-year service contracts then it’s come a long way toward getting ATT on board. ATT this week announced that it will let subscribers ditch their service contracts as long as they’ve been on it for at least six months and as long as they switch to a Next early upgrade plan that lets you buy a new smartphone once a year. Although critics initially slammed ATT’s Next plans as a cynical way to milk more money from customers, the carrier greatly upped its Next offerings with the debut of its Mobile Share Value plans late last year that cut your monthly bill by $15 once you’ve paid off your new smartphone’s