I don't think it is without losing the HTC apps, if you don't mind this then download an app off the Market and you can download themes! hope this helped :)
The settings of your HTC Wildfire will not change when you remove the SIM card, but you may lose your contacts.
No sorry.
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.
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!)
HTC Wildfire supports microSD cards by all the manufacturers.