Telekom Srbija — operating under its mts brand — is one of the largest telecom providers in Southeastern Europe, serving nearly 12 million users across Serbia and the region. Their mts Loyalty program, accessible via the AdBaloo app, rewards customers with “mts diamonds” every month. These diamonds can be used to bid in auctions for exciting prizes, and users can earn even more by playing live quizzes and completing fun challenges — all as a way for mts to thank their loyal customers.