Best BlackList by Smartphoneware automatically rejects unwanted callers. Real-time incoming number analysis and instant reject, easy to configure and use. Your phone will be always busy for unwelcome calls. This version is optimized for S60 5th Edition devices, inlcuding the 5800 XpressMusic and the N97.

http://my-symbian.com/s60v3/software...Auto=631&faq=1