A method for processing a failed connection to a telecommunication network, characterized in that it comprises the following steps: - sending, by a first terminal, an authentication request in order to access the telecommunication network; - failure of the authentication procedure because at least some of the connection data stored in a microcircuit card (ICC A) of the first terminal within a first access profile (P A) to the telecommunication network and used by the first terminal for authentication do not correspond to the corresponding data stored in a first subscription manager (SM A) or a telephone operator server (O A); - establishing a secure link between a second terminal, storing a second profile (P B) for access to the telecommunications network, and the first terminal; - communicating, from the first terminal to the second terminal and via the secure link, data relating to the first profile (P A); - transmitting, by the second terminal using the second profile (P B), the data relating to the first profile (P A) to a second subscription manager (SM B) of the telecommunications network; - transmitting data relating to the first profile (P A) from the second subscription manager (SM B) to the first subscription manager (SM A); - upon receipt of the data relating to the first profile (P A), sending, by the first subscription manager (SM A), the data relating to the first profile (P A) and corresponding data stored in the first subscription manager (SM A) to the telephone operator server (O A) within a first message; - upon receipt of this first message, determining, by the telephone operator's server (O A), whether the failure of the authentication procedure comes from a storage error at the first subscription manager (SM A) or from a storage error at the microcircuit card (ICC A); - when a storage error is detected at the first subscription manager (SM A), updating of data associated with the first profile (P A) within the first subscription manager (SM A); - when a storage error is detected at the microcircuit card (ICC A), transmitting connection data from the first profile from the first subscription manager (SM A) to the second subscription manager (SM B), then transmitting, by the second subscription manager (SM B), connection data from the first profile (P A) to the second terminal, then transmitting, from the second terminal and via the secure link, the connection data to the first terminal and storage of the connection data in the first terminal. - sending, by a first terminal, an authentication request in order to access the telecommunication network; - failure of the authentication procedure because at least some of the connection data stored in a microcircuit card (ICC A) of the first terminal within a first access profile (P A) to the telecommunication network and used by the first terminal for authentication do not correspond to the corresponding data stored in a first subscription manager (SM A) or a telephone operator server (O A); - establishing a secure link between a second terminal, storing a second profile (P B) for access to the telecommunications network, and the first terminal; - communicating, from the first terminal to the second terminal and via the secure link, data relating to the first profile (P A); - transmitting, by the second terminal using the second profile (P B), the data relating to the first profile (P A) to a second subscription manager (SM B) of the telecommunications network; - transmitting data relating to the first profile (P A) from the second subscription manager (SM B) to the first subscription manager (SM A); - upon receipt of the data relating to the first profile (P A), sending, by the first subscription manager (SM A), the data relating to the first profile (P A) and corresponding data stored in the first subscription manager (SM A) to the telephone operator server (O A) within a first message; - upon receipt of this first message, determining, by the telephone operator's server (O A), whether the failure of the authentication procedure comes from a storage error at the first subscription manager (SM A) or from a storage error at the microcircuit card (ICC A); - when a storage error is detected at the first subscription manager (SM A), updating of data associated with the first profile (P A) within the first subscription manager (SM A); - when a storage error is detected at the microcircuit card (ICC A), transmitting connection data from the first profile from the first subscription manager (SM A) to the second subscription manager (SM B), then transmitting, by the second subscription manager (SM B), connection data from the first profile (P A) to the second terminal, then transmitting, from the second terminal and via the secure link, the connection data to the first terminal and storage of the connection data in the first terminal.