Mac Rumors notes on some interesting results that have come from some efforts to hack into and explore the iPhone.

On the iPhone are several logo files, besides the default AT&T and Cingular logos there are also files for T-Mobile and Vodafone, both of which are included in recent rumours about the carrier of the iPhone Europe.

The following logo files are stored in the iPhone’s logo directory;

Default_CARRIER_ATT.png
Default_CARRIER_CINGULAR.png
Default_CARRIER_TMOBILE.png
Default_CARRIER_VODAFONE.png

Also of note it has been discovered that the ringtones on the iPhone are simply unprotected AAC (m4a) files in a directory. This would suggest that getting a ringtone onto the phone is as simple as copying it into the directory.