3GP is a multimedia container format defined by the Third Generation Partnership Project for 3G UMTS multimedia services. It is not only used on 3G cell phones but can also be played on some 2G and 4G phones.
3G2 is a multimedia container format defined by the 3GPP2 for 3G CDMA2000 multimedia services. It is quite similar to the 3GP file format, but has some extensions and limitations in comparison to 3GP.
3GP is defined in the ETSI 3GPP technical specification. 3GP is a required file format for video and associated speech/audio media types and timed text in ETSI 3GPP technical specifications for IMS, MMS, and MBMS.
Most 3G capable mobile phones support the playback and recording of video in 3GP format and it also mainly used on cell phones. Some newer/higher-end phones without 3G capabilities may also playback and record in this format. Audio imported from CD onto a PlayStation 3 when it is set to encode to the MPEG-4 AAC codec will copy onto USB devices in the 3GP format. So you can know the answer.
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