I find the power saving mode in Phone mode to be annoying and not sure whether you can switch it off.
Basically when you dial a number and when you hold the phone to your year the screen automatically blacks out. However sometimes when you need to dial something while on the call the screen will not turn back on and you have to put the phone to standby and turn back on again.

Is there a way to fix this.

Also for the first tiem alst night whne I played around with the stupid rotary dial app the phone suddenly hanged and autoamtically restarted!!! hope it is not something wrong with the phone. I guess you shoudl periodically power the phone down and reboot it to avoid system crashes?