Protecting a mobile device is provided. A first set of IoT devices in a first domain at a first geographic location is established by communicating with respective members of the first set of IoT devices. Respective ones of the first set of IoT devices are identified within the first domain as registered to a user corresponding to a mobile device based on a list of registered devices generating a registered subset of IoT devices that includes the mobile device. It is determined that the mobile device is in an unsecure environment based on establishing proximity to unknown IoT devices that are not members of the registered subset of IoT devices. A self-protection mode of operation is launched on the mobile device in response to determining that the mobile device is in the unsecure environment based on establishing proximity to the unknown IoT devices.
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