Mobile communication terminal , comprising - a display unit and an input unit , preferably a combined input-and-display unit , - a near-field communication interface , and - a control unit (SE), wherein the control unit (SE) is configured to read out at least one parameter (P) of a building services system (GT) via the near-field communication interface and to provide said parameter for a software application executed by the mobile communication terminal ; wherein the software application is designed to present a user interface on the display unit depending on the at least one parameter (P), and to evaluate a user input at the user interface via the input unit , and to transmit to the building services system (GT) control data based on the user input, wherein the software application is configured to provide functions for controlling the building services system (GT) which have different complexities; and wherein the software application presents the functions , grouped according to their complexity, on a plurality of logical levels by means of the user interface; wherein a switching on and/or off can be called at a first level, whereas a program and instructions to the building services system are input at further levels. - a display unit and an input unit , preferably a combined input-and-display unit , - a near-field communication interface , and - a control unit (SE), wherein the control unit (SE) is configured to read out at least one parameter (P) of a building services system (GT) via the near-field communication interface and to provide said parameter for a software application executed by the mobile communication terminal ; wherein the software application is designed to present a user interface on the display unit depending on the at least one parameter (P), and to evaluate a user input at the user interface via the input unit , and to transmit to the building services system (GT) control data based on the user input, wherein the software application is configured to provide functions for controlling the building services system (GT) which have different complexities; and wherein the software application presents the functions , grouped according to their complexity, on a plurality of logical levels by means of the user interface; wherein a switching on and/or off can be called at a first level, whereas a program and instructions to the building services system are input at further levels. wherein the control unit (SE) is configured to read out at least one parameter (P) of a building services system (GT) via the near-field communication interface and to provide said parameter for a software application executed by the mobile communication terminal ; wherein the software application is designed to present a user interface on the display unit depending on the at least one parameter (P), and to evaluate a user input at the user interface via the input unit , and to transmit to the building services system (GT) control data based on the user input, wherein the software application is configured to provide functions for controlling the building services system (GT) which have different complexities; and wherein the software application presents the functions , grouped according to their complexity, on a plurality of logical levels by means of the user interface; wherein a switching on and/or off can be called at a first level, whereas a program and instructions to the building services system are input at further levels. <EOS>