A system, comprising: a first device; and a second device; wherein the first device is configured to: obtain an embedded universal integrated circuit card, eUICC, identifier, EID, of the second device; send a first message to a mobile operator network indicating a profile download request, wherein the first message comprises the EID of the second device; receive profile download information with the EID from the mobile operator network; send the profile download information to the second device; wherein the second device is configured to: download, using the profile download information, a profile from a profile management server of the mobile operator network; install the profile in an embedded universal integrated circuit card, eUICC, of the second device; wherein the first device is further configured to: request to activate a multiple IMSI single MSISDN service when indicating said request to the mobile operator network for profile download information for the second device; send a unbinding request to the mobile operator network for unbinding said multiple IMSI single MSISDN service binding between the first device and the second device; receive an unbinding operation result from the mobile operator network; and send the unbinding operation result to the second device; wherein the second device is further configured to: delete the profile in the eUICC of the second device after receiving the unbinding operation result. a first device; and a second device; wherein the first device is configured to: obtain an embedded universal integrated circuit card, eUICC, identifier, EID, of the second device; send a first message to a mobile operator network indicating a profile download request, wherein the first message comprises the EID of the second device; receive profile download information with the EID from the mobile operator network; send the profile download information to the second device; wherein the second device is configured to: download, using the profile download information, a profile from a profile management server of the mobile operator network; install the profile in an embedded universal integrated circuit card, eUICC, of the second device; obtain an embedded universal integrated circuit card, eUICC, identifier, EID, of the second device; send a first message to a mobile operator network indicating a profile download request, wherein the first message comprises the EID of the second device; receive profile download information with the EID from the mobile operator network; send the profile download information to the second device; wherein the second device is configured to: download, using the profile download information, a profile from a profile management server of the mobile operator network; install the profile in an embedded universal integrated circuit card, eUICC, of the second device; download, using the profile download information, a profile from a profile management server of the mobile operator network; install the profile in an embedded universal integrated circuit card, eUICC, of the second device; request to activate a multiple IMSI single MSISDN service when indicating said request to the mobile operator network for profile download information for the second device; send a unbinding request to the mobile operator network for unbinding said multiple IMSI single MSISDN service binding between the first device and the second device; receive an unbinding operation result from the mobile operator network; and send the unbinding operation result to the second device;