Samsung a940 cell phone

[shaqster]

http://www.cellphonestalk.com/cellphonereviews/samsung/mma940/intro.html

i have a question: the website says

"Furthermore, the video recorder has the following features, filters and effects:
- AMR Audio
- MPEG-4 support
- H.263 Video"

now i know what MPEG4 is but i don't know what AMR and H.263 are...

[AnswerDude]

H.263 video format
http://en.wikipedia.org/wiki/H.263
AMR Audio format
http://en.wikipedia.org/wiki/Adaptive_Multi-Rate