1. A mobile cellular telephone, comprising: processing hardware; data storage hardware, coupled with the processing hardware, storing a hypervisor and a plurality of OSs (operating systems) including at least a first OS and a second OS; and the processing hardware, when the mobile device is operating, cooperating with the data store to execute the hypervisor, the hypervisor, when executing, providing machine virtualization to concurrently boot and execute the first OS and the second OS, the first OS having a substantially shorter boot time than the second OS, the first OS including cellular voice software that becomes available for use by the user when the first OS finishes booting and before the second OS finishes booting, the cellular voice software being available while the second OS continues to boot, the hypervisor concurrently executing the first OS and the second OS after the first OS has finished booting and after the second OS has finished booting.