This diploma thesis deals with the topic of „Position and Function of Call Centres in Telecommunications”. It focuses on alternative ways of customer´s communication with the company mainly by mobile phone. The content of this work is the characteristics of services, the specification of ways of communication between the customer and the company, the description of T-Mobile´s products using the alternative ways of communication with the company, the survey of T-Mobile´s Call centre´s activities and the research part. The aim of this work is to find out recomandations and progressions for improvement of working and standing of Call centre within the T-Mobile group. At the end of the work there are added some appendixes.