Semisilent Alternatives
Semisilent is described as 'Normally, you have two choices for cellphone calls: be available to called by anybody but potentially interrupted, or be able to focus and be unreachable. Enter SemiSilent with a much-needed third option' and is an app. There are three alternatives to Semisilent for iPhone. The best alternative is iBlackList. It's not free, so if you're looking for a free alternative, you could try MobileGate.
iBlacklist is the best firewall for calls, SMS and MMS available for the iPhone. It ables you to select from who you want to receive calls and hide messages. It also removes the sms popup preview protecting your privacy, has parental control mode by blocking outgoing calls, can...
Features
How to get MobileGate Load Cydia Add xSellize source ( if you dont have it allready ) : xsellize.com/cydia/ Search for MobileGate. Install.
MCleaner is a iPhone Call and SMS Filter program. With MCleaner you can block incoming calls and SMS messages automatically and protect your privacy. MCleaner allows you to create blacklists, whitelists, profiles and schedules to meet your individual needs.
Features
Discontinued