Wireless provider T-Mobile topped the rankings in the J.D. Power and Associates 2009 Wireless Customer Care Performance Study ñ Volume 1, scoring 755 out of a possible 1,000 points and edging out competitors Verizon Wireless, at 749, and Alltel, which scored 744 points. The survey asked customers to rate their experiences when dealing with T-Mobile via a phone call with either a live rep or an Aut
