How can i fix my wifi on my iphone 3g

i recently a iphone 3g  (not new). And the wifi and bluetooth isnt working, it is on 4.2.1.i am using it for a ipod.  Please help!

For Wi-Fi .. 
Reset the device:
Press and hold the Sleep/Wake button and the Home button together for at least ten seconds, until the Apple logo appears.
If that doesn't help, tap Settings > General > Reset > Reset All Settings
If that doesn't help, tap Settings > General > Reset > Reset Network Settings
No data is lost due to a reset.
You will have to re enter your Wi-Fi password.
If nothing above helped, try here >  iOS: Troubleshooting Wi-Fi networks and connections
For Bluetooth >   iOS: Troubleshooting Bluetooth connections

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