I called my colleague several times this afternoon because I wanted to discuss with him about work. But he didn't answer the phone. I don't know why he didn't pick up the phone. If someone does not pick up the phone when you call him or her, will you be angry or anxious? Sentences should start with a capital letter in English, personal pronoun 'I' must also be a capital letter. A few spelling mistakes for colleague and angry. Correction of the statement on - no response. All the best