No sorry.
The settings of your HTC Wildfire will not change when you remove the SIM card, but you may lose your contacts.
If your referring to the flashlight app that come preloaded which use the LED camera flash, then no it is only white. You can get apps that use the screen as a light in which case it would be possible to change the light colour.
HTC Wildfire was created in 2010.
HTC Wildfire S was created in 2011.
They are both similar but the HTC wildfire S is the more improved version and is smaller and easier to use.
The HTC desire is better because it has more features. But if you're on a budget then the HTC Wildfire is good.
The HTC Wildfire S is better than the HTC Explorer because it has more features.
It depends where you buy it from and what colour. The white unlocked phone costs £224 on Amazon.
Yes the wildfire S has a smaller body and only a 3inch screen and the graphics are better than the wildfire.
htc desire
The HTC Wildfire is rated better than an HTC Desire. This can also depend on who is voting for it, as well. Some people prefer the Wildfire because it is a little bigger.
The wildfire S. Better processor, better graphics and newer version of HTC sense and android OS are the highlights of the wildfire S. But you might find that the wildfire is cheaper (although the wildfire isn't exactly too expensive either!)