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A clever concept that uses customers to improve network quality, keep them engaged and bring them into the store is from the German subsidiary of the cell phone network Vodafone. The introduced the augmented reality and scaveenger hunt style game BufferBusters, where users can identify slow network connection and tag them geographically. Once their "buffer-tank" is full with these Buffer monsters, the players visit a Vodafone-store and upload the "monsters" by pointing at a QR-code at the wall. The best buffer munster hunters can win lifetime plans.