Abstract: Method to transmit multimedia data in instant messaging telematic services to and from devices, wherein in a same conversation between a calling device (Tc) and at least one receiving device (Tr), a resident program (App) is provided which, if executed, determines in the calling device the transmission to the receiving device (Tr) of all entered and/or deleted text data during a conversation through the text interface (TXT), and in the receiving device the representation in the video interface (SCR) of the device of said entered and/or deleted text and/or multimedia data with a delay of a few seconds, for example 2-3 seconds, with respect to the time of data entry in the calling device.