Task: Question Answering
Input (English): Context: This hard plastic pager - style holster is a very useful accessory for daily use . Clip it to your belt and you can secure your phone at all times ! The unique swivel design lets you rotate the clip 180-degree sideway at several fixed intervals . You can place your phone at the most comfortable and convenient position . 
Question: Why would someone need the belt clip ?
Output (English): It will keep their phone secure .