Fast reconfiguring environment for mobile computing devices

An example method includes receiving an indication of a selection of a first application environment that includes a first virtual environment associated with a first security domain and is configured to isolate execution of software applications within the first application environment, suspending execution of a second application environment that includes a second virtual environment associated with a second security domain different from the first security domain, initiating execution of the first application environment, identifying information associated with the first security domain and provided by the first application environment that is to be sent to an external computing device associated with the first security domain, selecting communication network(s) from one or more communication networks that are each available to the mobile computing device for data communication, encrypting, based on the first security domain and network(s), the information, and sending, to the external computing device via the network(s), the encrypted information.