A method for assisting with the installation of a home automation system comprising a plurality of communicating units and at least one control unit that are able to exchange information with one another via a local home automation network, said at least one control unit also being able to exchange information with a central platform of the Internet network via a wireless connection of the telephony type by packets, characterized in that it includes the following steps: - connecting a portable installation control unit by connection and said local home automation network, said portable installation control unit comprising, on the one hand, a modem for locally exchanging data with the communicating units of the local home automation network and with said at least one control unit, and on the other hand, a modem for accessing the Internet network to exchange data with the central platform via a wireless connection for each mobile operator from a predefined list of mobile operators; - in situ automatic test, from the portable installation control unit, of each connection to the central platform for each mobile operator from said list and selection, by the portable installation control unit, of the mobile operator from the list offering the best connection; - equipping said at least one control unit with a SIM card corresponding to the selected mobile operator; - automatically pairing, from said portable installation control unit, each communicating unit with said at least one control unit of said local home automation network; - operating tests (142-145, 150, 171, 172) of each communicating unit of the system and of the complete system from said installation control unit, said operating tests including a test by said at least one control unit, on demand by said portable installation control unit, of the connection to the central platform by going through said selected mobile operator. - connecting a portable installation control unit by connection and said local home automation network, said portable installation control unit comprising, on the one hand, a modem for locally exchanging data with the communicating units of the local home automation network and with said at least one control unit, and on the other hand, a modem for accessing the Internet network to exchange data with the central platform via a wireless connection for each mobile operator from a predefined list of mobile operators; - in situ automatic test, from the portable installation control unit, of each connection to the central platform for each mobile operator from said list and selection, by the portable installation control unit, of the mobile operator from the list offering the best connection; - equipping said at least one control unit with a SIM card corresponding to the selected mobile operator; - automatically pairing, from said portable installation control unit, each communicating unit with said at least one control unit of said local home automation network; - operating tests (142-145, 150, 171, 172) of each communicating unit of the system and of the complete system from said installation control unit, said operating tests including a test by said at least one control unit, on demand by said portable installation control unit, of the connection to the central platform by going through said selected mobile operator.