I have a htc P3300 Artemis pda with the setting "deactive device if unused for 3 minutes" for saving the battery and locking all inputs.
When the pda is inactive Fake Call don't run, while in this state I receive the standard calls regularly .
This is the only problem for the moment I found; however, the application is very nice and useful.

Thanks

I have also found that if I try to reactivate the device after the time setted for the fake call is past, the device is frozen!
In this case I need to do a soft-reset.