What is "Open Mode" and can it be revoked remotely? "Open" mode is when an unsigned kernel has been booted. Disabling it remotely would, presumably, require a change to the bootloader. See slide #??? --Jaffa 11:36, 13 October 2009 (UTC) Can network operators restrict you switching to Open mode? Like if a device is sim-locked to a particular network, does the device get locked down in closed DRM mode only too? Can you always switch to open mode? Elena Reshetova: If the device is SIM-locked, operator can restrict you to the usage of one particular kernel (slide 5), for example the one, which was shipped with a device. However, it is up to you to decide to buy the device from the operator or form the Nokia store.