What does the *#*#4636#*#* dialer code do? Has anyone tried the *#*#4636#*#* or *#*#7780#*#* dialer codes on HTC phones? They're not working for me.

Secondly, what does it show, means what kind of information? Is it safe to run on brand new phone?
Yes, I have a Samsung Galaxy S and the *#*34636#*#* does actually work.

It gives all sorts of statistics.

You might read my following question: regarding this exact number and contact lists.

-- EDIT --

Sorry, didn't see the HTC phones bit. Just noticed the 'Samsung-Galaxy-tab' tag, and thought you were talking about the Samsung Galaxy S phone.

The part about the statistics , is ok , though.

On my phone.


Phone information
Battery information
Battery history
Usage statistics ( I was very interested in this option )
Wifi information


Usage statistics


Usage time
Launch count