I find that I can nearly obliterate any wifi receptio on my N80ie if my hand is covering the back-right of it (camera button side). This is because the wifi antenna is basically just under the camera button, so if you hold it as normal, you are covering it up. Try holding it left handed, or just put it on a desk or something and you may see an enormous improvement. When the signal gets really weak, holding the phone so the side with the camera button is facing the source of the signal also helps.