A method is provided for definitive customization or customization for a predetermined duration related to a subscription of a radio communication terminal possessing an operating mode requiring the association with the terminal of a customization data set specific to a radio communication network, so as to allow the terminal to be linked with the radio communication network. The method includes the following steps: obtaining carrier information pertaining to carriers received by the terminal; and selecting a customization data set for the terminal, from a plurality of customization data sets, as a function of a selection criterion applied to the carrier information obtained.