The following links reference the iPhone Developers Blog. These brilliant people are continually updating their software to enable better control of the iPhone / iTouch you've purchased.
The options provided include:
- Additional software not provided or sanctioned by Apple Inc.
- Access to the file system.
- Custom ringtones, wallpapers, themes.
- Maintaining your 'Think ...Different' attitude.
First, know your hardware version; I.E. is it a 2G-(the original model), 3G, or 3GS iPhone.
Second, check your Software and Firmware versions:
[Touch Settings > General > About]
Note the [operating system software] Version and Modem Firmware.
If you have operating system software (sometimes referred to as the firmware):
Version 2.2 click here.
Version 2.21 click here.
Version 3.0 click here.
Version 3.0.1 click here.
Version 3.1 unavailable at this time.
Bonus! iClarified has several iPhone step-by-step guides here.
(iClarified's iTouch step-by step guides here.)
