The object of the invention is a method for determining the coverage area of a base transceiver station (BTS) of a cellular network and for finding the optimum place of location of the base transceiver station (BTS). The method comprises connecting a wireless terminal (21) to the base transceiver station (BTS) using a local connection and commanding from the wireless terminal (21) over said local connection the base transceiver station (BTS) to transmit a signal having a specific frequency. The wireless terminal (21) is commanded to receive said frequency. In the wireless terminal (21), the received power of said signal is measured and the numerical value of the received power is displayed on the display (UI) of the wireless terminal (21) for determining the coverage area of the base transceiver station (BTS). The object of the invention is also a wireless terminal (21) that implements the method, as well as a computer program product (51).