This just happened recently, after I turned on Bluetooth for the first time. Usually, when I turn the phone on from sleep mode, a message pops up that says it detects wifi signals; only if it was on the EDGE network the night before. When I put it back to sleep mode for the night, the next morning, after I turn it back on, the phone is still on WiFi mode. However, after I started to use my Bluetooth headset, Wifi doesn't automatically gets noticed by my phone anymore, unless I manually go to Options menu. Even when I leave the phone on WiFi when I turn it off on sleep mode, it switches to EDGE when I turn it back on after a few minutes. Anyone knows if this is normal?