A secure communication method, which enables to establish secure communication and allows a wide coverage area, comprising the steps of - a user making a call request, - a mobile device of the user finding the number of the subscriber's GSM data channel number from a list in a memory module of the mobile device, - the mobile device starting a call to the subscriber via the GSM data channel, characterized by the steps of - a control module the mobile device controlling whether secure communication is established or not within 60 seconds from the moment the call is started via the GSM data channel, - if the control module detects, during the control process it carries out within 60 seconds from the start of the call via the GSM data channel, that secure communication is not established, the mobile device finding the subscriber's GSM voice channel number from the list in the memory module; and the mobile device, by using the GSM voice channel number of the subscriber, starting a call to the subscriber having the said number via the GSM voice channel, - if the control module detects that communication is established at any time within 30 seconds following the start of the call via the GSM voice channel, the control module carrying out an identity control within 30 seconds beginning from the moment of the said detection, - if the control module performs identity verification at any time within the said 30 seconds, stopping the identity control process and performing secure communication by providing data flow via the GSM voice channel, - if the control module detects that secure communication is not established within 30 seconds from the start of the call via the GSM voice channel or detects that identity verification is not performed within the 30 seconds following the moment it stops the control upon determining that secure communication is established via the GSM voice channel, the mobile device finding the subscriber's satellite phone number from the list, - starting a call to the subscriber via the satellite data channel, - providing secure communication. - a user making a call request, - a mobile device of the user finding the number of the subscriber's GSM data channel number from a list in a memory module of the mobile device, - the mobile device starting a call to the subscriber via the GSM data channel, - a control module the mobile device controlling whether secure communication is established or not within 60 seconds from the moment the call is started via the GSM data channel, - if the control module detects, during the control process it carries out within 60 seconds from the start of the call via the GSM data channel, that secure communication is not established, the mobile device finding the subscriber's GSM voice channel number from the list in the memory module; and the mobile device, by using the GSM voice channel number of the subscriber, starting a call to the subscriber having the said number via the GSM voice channel, - if the control module detects that communication is established at any time within 30 seconds following the start of the call via the GSM voice channel, the control module carrying out an identity control within 30 seconds beginning from the moment of the said detection, - if the control module performs identity verification at any time within the said 30 seconds, stopping the identity control process and performing secure communication by providing data flow via the GSM voice channel, - if the control module detects that secure communication is not established within 30 seconds from the start of the call via the GSM voice channel or detects that identity verification is not performed within the 30 seconds following the moment it stops the control upon determining that secure communication is established via the GSM voice channel, the mobile device finding the subscriber's satellite phone number from the list, - starting a call to the subscriber via the satellite data channel, - providing secure communication.