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RBT is when the caller assigns a song / caller tune to the people that he/she calls. The objective here is that the caller picks his/her preferred song and assigns it to the different people that he/she calls. He/she can pick as many songs as he/she wants and can change as many times as they want as long as they have credit.

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The purpose was to create a series of poster visuals that can reflect a touch of individual music genres, taste and sense of style at the same time. Tigo had brought a user friendly caller tune portofolio that customers can customise based on their needs.