Method for exchanging data with a mobile communication network using at least one group of cloned subscriber identity modules (21, 22, 23), the mobile communication network comprising an access network and a core network, wherein the group of cloned subscriber identity modules (21, 22, 23) comprises a plurality of separate subscriber identity modules, each having an assigned IMSI, International Mobile Subscriber Identity, and an assigned MSISDN, Mobile Subscriber Integrated Services Digital Network Number, the assigned IMSI and/or the assigned MSISDN being identical for the subscriber identity modules of the group of cloned subscriber identity modules, wherein the group of cloned subscriber identity modules (21, 22, 23) is associated to a group of user equipments and/or MTC user devices, machine type communication user devices, each of these user equipments and/or Machine Type Communication, MTC, user devices comprising at least one subscriber identity module of the group of cloned subscriber identity modules (21, 22, 23), wherein the group of cloned subscriber identity modules (21, 22, 23) comprises at least a first cloned subscriber identity module and a second cloned subscriber identity module, wherein in case that the user equipment or the MTC user device corresponding to the first cloned subscriber identity module is already attached to the mobile communication network the method comprises the following steps: -- in a first step, attachment to the mobile communication network is requested - using the second cloned subscriber identity module - by a corresponding user equipment or MTC user device sending a first attachment request, -- in a second step, subsequent to the first step, the first attachment request is rejected by the mobile communication network - as the user equipment or the MTC user device corresponding to the first cloned subscriber identity module is still attached to the mobile communication network - and a waiting time information indicative of a waiting time interval is transmitted, by the mobile communication network, to the user equipment or the MTC user device corresponding to the second cloned subscriber identity module, -- in a third step, subsequent to the second step, attachment to the mobile communication network is requested, by the user equipment or the MTC user device corresponding to the second cloned subscriber identity module, using a second attachment request, the second attachment request being sent after the waiting time interval has elapsed. -- in a first step, attachment to the mobile communication network is requested - using the second cloned subscriber identity module - by a corresponding user equipment or MTC user device sending a first attachment request, -- in a second step, subsequent to the first step, the first attachment request is rejected by the mobile communication network - as the user equipment or the MTC user device corresponding to the first cloned subscriber identity module is still attached to the mobile communication network - and a waiting time information indicative of a waiting time interval is transmitted, by the mobile communication network, to the user equipment or the MTC user device corresponding to the second cloned subscriber identity module, -- in a third step, subsequent to the second step, attachment to the mobile communication network is requested, by the user equipment or the MTC user device corresponding to the second cloned subscriber identity module, using a second attachment request, the second attachment request being sent after the waiting time interval has elapsed.