Here the codes are to be used in the address bar of Opera Mini. Make sure that you delete http:// or http://www from the address bar before applying the following listed codes.
config:

If you are interested in knowing the configuration of your mobile phone browser, its capabilities and default settings then you can try the code config: in the address bar. The code will open up an internal page of opera mini called Opera Mini's Power User Settings page where you can tweak many browser settings like the timeout and whether the browser should make phone numbers click-able. This is quite handy as you might need to change the timeout wait time set by default.

server:source

Web developers will appreciate server:source which displays the source code of the current page. That way you can make out the entire html construction code of the site you are visiting. Its quite a handy tool when you have to view and edit your own sites html code setup.

opera:cache

Not exactly editable but it lets you know how much memory the cached content is chewing up in your mobile phone. This code can be your answer to your curiosity of opera mini slower loading. If the cached content is too much, you can always delete it and make the browser load faster.

about:

Most of us know that Opera Mini utilizes a proxy server technology to compress web pages for faster and better site loading. Opera Mini does this in order to minimize amount of data transfer and make the content load faster on the phone. Usage of this code allows display of information about the Opera Mini server.

debug:
It Displays a page listing many Opera mini server and client properties. The Hosti] field tells you which Opera Mini server you are currently connected to. The known locations of servers are US, Poland, Iceland, Norway, South Africa etc. The server location is usually camouflages by an alphabetic notation. Servers between r02-12 are usually in the US. In certain cases the[i]r may be replaced with t,v,z etc.

feed:list

Opera mini is known to load feeds in a very mobile friendly format, using this secret code you will be able to conveniently navigate to the Feeds page

opera:about

This secret code displays copyright and license information for third party software used in the browser. Its not so much important but if you are only curious then there is no harm in simply trying it.

server:reset

A secret code of far more convenience. This clears all cookies stored in your locale thus safeguards you from being tracked by any analytics program.

server:refresh

You may not want to use this code as there is an easier way to reload the current browser page in opera mini, yet still, just for you can test this code and see if it refreshes the current page on your opera mini browser.