phonebook files...

Hi

Do somebody know how software system work in a
regular cell e.g. Nokia 6230, not smartphone.

Concerning the phonebook:

1. Is all contacts stored as one single file
or
is each contact stored as a file itself, which
means the phonebook folder consist of multiple
files (of contacts)?

2. whatīs their file extension? I got confusing results
in google as .CSV , .vcf (visit card file)
and .pbf (phonebook file)

3. Where can find such information or articles about
the structure of the "software system" in phones?
Iīve heared itīs similar to computerīs OS, but 1000
times simplier and containing a similar files n folder
system

4. Lastly check this link, who says you need drugs to
get hallucinated

http://www.skyscrapercity.com/showth...1&page=1&pp=20

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well its dangerous to do it alone , u need some one who is a bit pro. with changing softwares . So i suggest u take it to a nokia center or any place