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I have the Curve 8320. The past days I've been able to connect to my home wifi network; but today, it can't connect! It says: reason: W002: Wifi Connection Failed. Now my laptop's on my wifi with no problem, and my phone can connect to our neighbor's wifi with no problem. Know why it can't connect to mine?
Did you change your router security settings or passkey at all? Maybe your connection attempts used up the router's IP address pool. Try rebooting the router and see if your phone is able to reconnect.
FWIW here's a link that describes all the W codes and possible causes:
Wifi / UMA Error Codes - BlackBerryFAQ
occasionally I have the same problem, there are three solutions for me:
1. turn the wifi radio off, count to 3, turn it back on.
2. Battery pull(loving quickpull for this)
3. Reset the router.
Usually #1 works