How can I access the call_history.db file(including other database files) ?

I hope that access call_history.db file under "@/private/var/mobile/Library/CallHistory/call_history.db" folder in iPhone.

Some people tell following this :

1. Note that the database cannot be accessed using standard SDK or API.
2. Issue is we cant connect to call_history.db by SQLite or FMDB. While opening the database it through an error : "Unable to connect database".

Please give me the solution about access to call_history.db file.

You want an iPhone app that accesses the file? There's a command-line tool in Cydia, SQlite3. You could install that (and learn it).

If you first transfer the file to a computer, you can open it with all kinds of tools. On Windows there's the free sqlitebrowser, or the Firefox extension SQLite Manager, and several other free tools. For the Mac and Linux there are probably many options too.