A method in a cellular communication network comprising at least a home location register/home subscriber server (HLR/HSS) that stores managing parameters related to a SIM card associated to a cellular terminal configured to be connected to the network, said managing parameters comprising at least an International Mobile Subscriber Identifier (IMSI), and at least a routing node configured to route requests between the cellular terminal and the HLR/HSS, wherein: the method comprises at least a step of provisioning a recycler node which comprises backing up in at least a database of said recycler node said managing parameters comprising said IMSI; characterized in that: • when said SIM card that stores said IMSI has not been used for at least a quarantine duration the method performs the following steps: - de-provisioning at least the HLR/HSS by removing from the HLR/HSS an identifier of a subscription (MSISDN 19) associated to the SIM card and said IMSI, while the cellular terminal is not attached to the network and without replacing said IMSI stored in the SIM card; the method also comprises the following steps performed when said SIM card has not been used for at least the quarantine duration: - sending any attachment request emanating from said SIM card to the recycler node, which comprises associating, in the routing tables of the routing node, said IMSI of said inactive SIM card with an address of said recycler node; - after the provisioning of the recycler node, after the de-provisioning of at least the HLR/HSS and upon reception at the recycler node of an attachment request emanating from said SIM card, the method comprises reactivating the SIM card through performing the following steps: - re-provisioning at least the HLR/HSS by associating in the HLR/HSS the set of managing parameters related to said reactivated SIM card restored from the database with a new identifier of a subscription (new MSISDN 19), the set of managing parameters comprising said IMSI. the method comprises at least a step of provisioning a recycler node which comprises backing up in at least a database of said recycler node said managing parameters comprising said IMSI; characterized in that: • when said SIM card that stores said IMSI has not been used for at least a quarantine duration the method performs the following steps: - de-provisioning at least the HLR/HSS by removing from the HLR/HSS an identifier of a subscription (MSISDN 19) associated to the SIM card and said IMSI, while the cellular terminal is not attached to the network and without replacing said IMSI stored in the SIM card; • when said SIM card that stores said IMSI has not been used for at least a quarantine duration the method performs the following steps: - de-provisioning at least the HLR/HSS by removing from the HLR/HSS an identifier of a subscription (MSISDN 19) associated to the SIM card and said IMSI, while the cellular terminal is not attached to the network and without replacing said IMSI stored in the SIM card; - de-provisioning at least the HLR/HSS by removing from the HLR/HSS an identifier of a subscription (MSISDN 19) associated to the SIM card and said IMSI, while the cellular terminal is not attached to the network and without replacing said IMSI stored in the SIM card; the method also comprises the following steps performed when said SIM card has not been used for at least the quarantine duration: - sending any attachment request emanating from said SIM card to the recycler node, which comprises associating, in the routing tables of the routing node, said IMSI of said inactive SIM card with an address of said recycler node; - after the provisioning of the recycler node, after the de-provisioning of at least the HLR/HSS and upon reception at the recycler node of an attachment request emanating from said SIM card, the method comprises reactivating the SIM card through performing the following steps: - re-provisioning at least the HLR/HSS by associating in the HLR/HSS the set of managing parameters related to said reactivated SIM card restored from the database with a new identifier of a subscription (new MSISDN 19), the set of managing parameters comprising said IMSI. - sending any attachment request emanating from said SIM card to the recycler node, which comprises associating, in the routing tables of the routing node, said IMSI of said inactive SIM card with an address of said recycler node; - after the provisioning of the recycler node, after the de-provisioning of at least the HLR/HSS and upon reception at the recycler node of an attachment request emanating from said SIM card, the method comprises reactivating the SIM card through performing the following steps: - re-provisioning at least the HLR/HSS by associating in the HLR/HSS the set of managing parameters related to said reactivated SIM card restored from the database with a new identifier of a subscription (new MSISDN 19), the set of managing parameters comprising said IMSI. - re-provisioning at least the HLR/HSS by associating in the HLR/HSS the set of managing parameters related to said reactivated SIM card restored from the database with a new identifier of a subscription (new MSISDN 19), the set of managing parameters comprising said IMSI.