A converged device including a first subsystem and a second subsystem, configured to operate in multiple operation modes with varying levels of security. One example provides a method for operating the device. The method includes determining, during a startup sequence of the first subsystem and with a first processor of the first subsystem, a last operation mode for the first subsystem. The method includes determining, responsive to detecting that a SIM is installed in the converged device, a network type for the SIM. The method includes controlling, with the first processor, a first communication interface based on the network type and the last operation mode. The method includes determining, during a startup sequence of the second subsystem and with a second processor of the second subsystem, the last operation mode for the first subsystem and controlling, with the second processor, a second communication interface based on the last operation mode.