the computing module 104 if the user input password is invalid step 208 proceeds to step 201 where the pda returns to an idle state and the pda is not locked if the user input password is valid step 208 proceeds to step 209 where an event is triggered to lock the computing module 104 optionally the computing module 104 can be switched off optionally a pop up screen may be displayed to prompt the user for a password for unlocking the pda optionally the present invention may also be configured to lock the wireless module 103 when the computing module 104 is locked in this manner in a second embodiment of the present invention a special sms message is used to retrieve information from a wireless pda the retrieved information is then returned as an sms message to the sender of the special sms message or to another destination information that can be retrieved includes contact information calendar information bank account number files documents and the like for this purpose he may use the present invention as described below an example of an sms message format for retrieving contact information is u201c hpretrievecontact os password name of contact u201d similar to the foregoing description u201c hpretrievecontact u201d is a header of.