All calls must be rejected when you are busy! There is a situation where you have to reject all calls. – Call Block App for Nokia.  – “I’m BUSY” is a cutting-edge call blocking application which simplify blocking of call. It doesn’t have too many options which lead to confusion in the above situation, with “I’m BUSY” you just simply start the application and set I’m BUSY to YES then all calls will be rejected Compatible with S^3 / Anna / Belle Smart Phones.