Disclosed is a method for determining a data transfer speed of a telecommunications network including a mobile terminal and a server, the method including: starting a measurement application; starting a user application that transfers data between the terminal and the network; ascertaining a measurement sequence including multiple measured values of the data transfer produced by the user application; transferring the sequence to the server; starting analysis software; determining a data block with a continuous data transfer rate greater than 0 kbit/s and a subsequent data transfer rate that is less than the continuous data transfer rate for at least 2 seconds after the data block; and determining from the data block a period of time for the transfer of a defined data volume and/or a data volume to be transferred in a defined period of time as data transfer speed of the telecommunications network.