Many people these days use cell phone for watching videos in good quality; 3gp is a very popular file format which is very much compressed in size. 3gp is known as Third Generation Party Project, this file format is used mostly on all 3g devices but it is also played on some 2g and 4g devices. 3gp files are very short sized and highly compressed so that these files can be played on mobile phone easily. 3gp file format stores data as MPEG 4 Part 2 or MPEG 4 Part 10 and the audio is stored in this format as AMR-NB.