"Security Call & Sms" include ?
"Private call" :
+ "Block call" : block any call from your blacklist
+ "Flash call" (Strobe effect - Lighting effect --> "ringingflashlight" ) : show flash when you receive a call (control byseconds)

"Private sms" :
+ "Block SMS" : block any SMS from your blacklist
+ "Hide SMS" : hide SMS from your SMS list (<4.4)
+ "Flash SMS" ("ringing flashlight"): show flash when you receive aSMS (control by seconds)