I told you two weeks ago that T-Mobile won more accolades from J.D. Power and Associates for its customer service. Well, now the secret to the carrier's success may be out, as the Seattle Post-Intelligencer is attributing T-Mobile's customer-service rankings to good old-fashioned honesty. The carrier's personal coverage check allows potential and current customers to gauge coverage in their area. Depending on location, the maps can be very detailed, even up to the city block. The Post-Intelligencer says the coverage check is part of T-Mobile's "no secrets" philosophy, which directs salespeople to be honest about the carrier's coverage.