1. A computer-readable storage medium comprising instructions that, when executed, cause one or more processors of a mobile computing device to: provide a phone application and a second, different application on the mobile computing device, wherein the phone application is executable to process phone calls using the mobile computing device, and wherein the second application is executable to perform one or more tasks not related to processing phone calls using the mobile computing device; initiate a first mode of operation when the mobile computing device becomes locked; prohibit user access to the second application during the first mode of operation when the mobile computing device fails to wirelessly detect a presence of an external device; and initiate a second mode of operation when the mobile computing device wirelessly detects the presence of the external device and when the mobile computing device has received user input specifying an access password, wherein the mobile computing device allows complete user access to both the phone application and the second application during the second mode of operation.