a handover method for a cellular radiotelephone networks in which , a call having been set up with a mobile via a first transceiver of a first cell , the handover consists in handing over to a second transceiver of a second cell and in switching in the mobile from the first transceiver to the second transceiver . the switching instruction interrupts the call in a defined cut - off time interval . the instruction to hand over the call is given under conditions such that the interruption of the call which may result from the handover operation occurs during the defined cut - off time interval .