In WhereRU, you can specify a message or a set of messages that when your phone receives one of them will automatically turn to the normal mode.
Here are some of its features:
1- You can activate or deactivate the application easily.
2- You can put one or more messages which are used to recognize whether to turn the phone to the normal mode or not.
3- You can specify one contact or more that can open your phone through sending one of the messages.
4- You can enable any phone to be used by checking the "Accept any number" check box instead of specifying some contacts to do.