Method and device for controlling usability of a communication device

A method, carried out by a communication device, for controlling usability of the communication device, comprising:

• initiating, at power-up of the communication device, a boot of an embedded Universal Integrated Circuit Card (eUICC) in the communication device, wherein the eUICC comprises circuits and memory for storing and executing operating software, a root security domain including executable applications and registers that manage and maintain a state of the communication device, and a boot service that determines the maintained state of the communication device, and wherein the eUICC further includes an access circuit connected to a modem, and wherein the eUICC is connected to the access circuit for cellular authentication and access;
• initiating, at power-up of the communication device, a boot of a processing unit of the communication device;
• executing the boot service in a secure element in response to an instruction in a boot code of the processing unit;
• suspending the initiated boot of the processing unit while executing the boot service in the secure element;
• determining, by the boot service in the secure element, the state of the communication device maintained in the eUICC;
• and
• booting a partition of either a primary operating system or a secondary operating system, wherein the primary or secondary operating system partition is booted dependent on the state of the communication device maintained in the eUICC.