I flashed a custom rom to get rid of all the bloatware on my Android phone Samsung Galaxy S3 4G (GT-i9305) for the first time yesterday, and my choice was CyanogenMod, and one thing I miss from Samsung Touchwiz is the Block feature where I could choose which persons phone calls and messages that still should got through the blocking, I could make a personal list with it. So maybe this feature is what I want?
it will support blocking of calls and messages, will be configurable through Settings, Phone, and Messaging, and available to third-party apps via a "new Content Provider API".
Users can enter blacklisted numbers from their address book (the People app) and even block numbers with wildcards, or those that are unknown and/or private.
Via: Android Police