Blacklist Mobile Lite protects you from unwanted calls, sms, mms from a particular contact. Just add the contact you wish to ignore using "Contacts" menu and forget about the person who annoy you. You can also consider blocking unknown (not from address book) or hidden numbers. And if you receive lots of SMS-spam messages every day Blacklist Mobile will solve this as well: just specify SMS-spam gate address i.e. 4440 or HOTLADIES and all messages from those senders will be blocked.