Using Speaker Phone
Once your in a phone call, you'll see a small speaker icon just below where contact picture is. just tap for speaker on and then again for speaker off. there is also a mute mic icon there as well. one more tip, if your in a call and screen goes black, just click trackball. hope this helps you out.
as for the weather city, go into the weather app and go to remove area and sekect the cities you want to remove and remove them. i my self dont use the standard weather app at all i use weatherbug. has nice widget.