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which wi-fi network u ususally connect with??? is that ur home network or somewhere outside??
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actually bro when you get no gateway reply you have to check out your network like your router or modem, just to make sure the wireless part is working, cuz, the n80 might think its still connecting to your home network the one you have preconfigured and its using the same WEP key you set up or the same SSID so if either of those cfhanged in the past days you have to redoit on the modem/router and then update them on the N80
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wait may b i cn help ya
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which connection u usin? i mean internet connection?
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chk this may b this can help ya,, m nt sure if it will work or not.. but jst trin 2 help ya:

Click Here
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i use outdoor wi-fi
i can't just go to the router and configure it

before it works but now it won't