A method for identifying a user using a communication device, wherein an identification document is assigned to the user, the method comprising: capturing a biometric feature of the user by means of the communication device in order to obtain a captured biometric feature; transmitting the captured biometric feature to an electronic identification service via a communication network by the communication device; and reading out a biometric reference feature from an electronic circuit of the identification document by the communication device in order to obtain a read-out biometric reference feature; and transmitting the read-out biometric reference feature by the communication device via the communication network to the electronic identification service, in particular together with the captured biometric feature, wherein the reading out of the biometric reference feature from the electronic circuit of the identification document by the communication device further comprises reading out a personal date in order to obtain a read-out personal date, and wherein the transmitting of the read-out biometric reference feature by the communication device via the communication network to the electronic identification service further comprises transmitting the read-out personal date to the electronic identification service; and comparing the captured biometric feature with the read-out biometric reference feature by the electronic identification service in order to identify the user, wherein the electronic identification service further transmits a certification of the identification to an electronic network service via a communication network in response to an identification of the user. capturing a biometric feature of the user by means of the communication device in order to obtain a captured biometric feature; transmitting the captured biometric feature to an electronic identification service via a communication network by the communication device; and reading out a biometric reference feature from an electronic circuit of the identification document by the communication device in order to obtain a read-out biometric reference feature; and transmitting the read-out biometric reference feature by the communication device via the communication network to the electronic identification service, in particular together with the captured biometric feature, wherein the reading out of the biometric reference feature from the electronic circuit of the identification document by the communication device further comprises reading out a personal date in order to obtain a read-out personal date, and wherein the transmitting of the read-out biometric reference feature by the communication device via the communication network to the electronic identification service further comprises transmitting the read-out personal date to the electronic identification service; and comparing the captured biometric feature with the read-out biometric reference feature by the electronic identification service in order to identify the user, wherein the electronic identification service further transmits a certification of the identification to an electronic network service via a communication network in response to an identification of the user.