(At 1st, I am not good at writing English language. I sometimes write
unusual expression.)

NTT Docomo is #1 mobile phone career in Japan. (almost 50% share)

NTT Docomo's Android phones send IMEI always by pre-installed video/
audio player in HTTP User-Agent header
and custom header named "x-dcmstore-imei".

Every web server can get IMEI via User-Agent header if a web server
has audio/video contents.

In hitorycal reason, Japanese mobile content provider often use IMEI
as authentication key.

I think this spec is a security problem. How dou you think ?

See also:
  "Music, Video | Service, Function | NTT Docomo" HTTP header
information (written in Japanese language)
  
http://www.nttdocomo.co.jp/service/developer/smart_phone/service_lineup/music_movie/index.html

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