Det Bounyasane is one of the Phone sales agents at the Costco phone kiosk. He helped us with T-Mobile. The process was long but that was only because it was a Friday and it was after five. We were getting the new iPhone 6s. He did everything correctly and efficiently. He was very well-versed in product knowledge which I appreciate. And took the time to help other customers while helping us. This is the best customer service that I have seen for a long time. I would like to recommend the Costco wireless kiosk because they are cheaper in the long run rather than going to a main store. Thank you so much for getting us our brand-new phones Det.