Iphone 3g can not find wi fi?

Iphone 3g can no longer find wifi?  Have reset setting and reinstall oringal settings on the phone. Can anyone suggetst anything esle?

Try Settings/General/Reset - Reset Network Settings
If that doesn't fix it go to the same place and Reset All Settings.
You will not lose any data with either reset, but you will have to re-enter WiFi passwords (if it fixes the WiFi problem, of course).
If it still doesn't work do a Restore with iTunes, and set up as a new phone. Do not add any apps or change any settings. If WiFi networks are still not detected you probably have a bad WiFi chip.

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