I have started using the HTC Wildfire, and have a small niggle with it. When making a call, the screen blacks out to conserve power. This makes it awkward when you have to enter a number i.e. for an automated phone call response. Is there a setting to display the screen during a call?
I'm not sure about the Wildfire, but on my Desire HD when I take the phone from my face, the motion sensor detects it and re-awakens the screen automatically. I'm not sure if it's a setting, a Froyo feature, or maybe an HTC sense feature.
What you're looking for is Screebl - a background service that monitors the phone's orientation, and based on that orientation decides when to allow the phone's power-saving features to operate.
There's a PRO version too that allows for integration with Locale amidst other extra features.
Also check out Shake Awake from Maplekey (in the market) - it allows you to wake the phone during a call with a shake.
I also think that pressing the HOME key should turn the screen on again. Try and let us know.
In your phone dialer enter the following sequence:
will show you Shutdown App configuration - you can choose to have the device power off directly instead of showing the menu for Airplane Mode / Power Off etc. when you long-press the power button. There's also an option for keeping the LCD on during the duration of a call.
Have you tried a longer screen timeout?
Settings | Display | Screen timeout
I am not sure on Wildfire, but I am using HTC hero.
You could have a try to press the key (like home, return or anything) or press the optical mouse, then it back to the phone call screen, then you can press num key after pressing the lower left hand corner Bn from the UI.