Step 10: Changing your Phone's Settings
The first step would be to register yourself on the operator's DND(Do Not Disturb) list for calls and SMSs. That would prevent any telemarketing calls from making your system go bonkers!
Then set the following settings on your phone:
1. Set the "Vibrate Once" alert type for SMS received.
2. Change the main menu order so that the SMS menu is on top of the list.(optional)
3. Delete all SIM card (NOT phone) contacts and keep only one number saved under any name.(Phone number of the person who will receive the "error" SMS)