The invention aims at facilitating the use of called numbers in a subscriber's country of origin, having a mobile radio terminal, when the subscriber is travelling abroad. When the called number NA = 0 NN is not an international number, a country of origin indicator (MCC0) read (S2) in the identity code IMSI of the user and a code (MCCE) of the country where the terminal is located (MS) read (S3) in a local area identifier (LAI) are compared (S4). The called number is not modified (S5) when the country indicators compared are identical. A code CC0 of the country of origin is added at the beginning (S8) of the called number when the country indicators compared are different, so that the number transmitted by the terminal is in the international format (S9).
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