The carrier, which was left off of 's iPhone 5 carrier partner list this week, nevertheless managed to make headlines by wooing unlocked iPhone users ahead of the Now its revealing of Tappy promises to garner the carrier a little more attention on "iPhone 5 Week."

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According to a blog post by T-Mobile VP of engineering services and quality assurance , the robot is used in its Device Validation Lab, which consists of a dozen individual labs where engineers test phones for everything from durability in harsh conditions to basic signal quality and software compliance.

The robot, which has actually been in use for a few years after an enterprising internal engineer built it, can plow through monotonous smartphone app usage tests way faster than a human: a simulation can test a week's worth of apps usage in 24 hours. Phones must work flawlessly for 24 hours to pass muster. Castle claims the company's robot has helped T-Mobile cut device return costs by 75%.