Stefan Kaliner is active in the mobile telecommunication business since 1992.
Starting his professional career at DETECON GmbH, he was responsible for the specification and validation of Smart Card systems for Deutsche Telekom's first GSM network "D1". As of 1993, now with T-Mobile Deutschland, he held a number of project management positions, extending his scope to SIM manufacturing and logistics. With the focus moving to UMTS, he got the responsibility for the provisioning and introduction of common UICC & SIM platforms for the multi-national T-Mobile Group. As Head of UICC Development he is currently responsible for the further evolution of group-wide SIM platforms at T-Mobile's holding company Deutsche Telekom.
Throughout all his time, he has been active in international standardisation, mainly in 3GPP CT6.