A federal court has granted T-Mobile a preliminary injunction against ATT subsidiary Aio Wireless on grounds that the low-cost carriers color scheme infringes on T-Mobiles iconic magenta. In the decision, Federal District Court judge Lee Rosenthal writes that T-Mobile has shown a likelihood that potential customers will be confused into thinking that Aio is affiliated or associated with T-Mobile based on the confused association between Aio’s use of its plum color and T-Mobile’s similar use of its similar magenta color. The opinion preliminarily prohibits Aio Wireless from using its plum color in advertising, marketing, and store design.