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The 3G2 file format can store the same video streams and most of the audio streams used in the 3GP file format.In addition, 3G2 stores audio streams as EVRC, EVRC-B, EVRC-WB, 13K (QCELP), SMV or VMR-WB, which was specified by 3GPP2 for use in ISO base media file format.
3GPP allowed use of AMR and H.263 codecs in the ISO base media file format (MPEG-4 Part 12), because 3GPP specified the usage of the Sample Entry and template fields in the ISO base media file format as well as defining new boxes to which codecs refer.
The MP4 and the AVC file format specifications described usage of MPEG-4 content in the ISO base media file format.
A 3GP file is always big-endian, storing and transferring the most significant bytes first.
It is most commonly used to store digital video and digital audio streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images.
Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet.
These extensions were registered by the registration authority for code-points in ISO base media file format ("MP4 Family" files).
For the storage of MPEG-4 media specific information in 3GP files, the 3GP specification refers to MP4 and the AVC file format, which are also based on the ISO base media file format.
It is supported by most smartphones, including the Apple i Phone.3GP is based on the structure of MPEG-4 Part 14, otherwise known as MP4.
3GP was designed to reduce the overhead in terms of storage and bandwidth to allow video files that could be handled by smartphones.
3GP is a required file format for video and associated speech/audio media types and timed text in ETSI 3GPP technical specifications for IP Multimedia Subsystem (IMS), Multimedia Messaging Service (MMS), Multimedia Broadcast/Multicast Service (MBMS) and Transparent end-to-end Packet-switched Streaming Service (PSS).
3GP and 3G2 are container formats similar to MPEG-4 Part 14 (MP4), which is also based on MPEG-4 Part 12.
The 3GP and 3G2 file format were designed to decrease storage and bandwidth requirements to accommodate mobile phones.