Aaargh!
I have spent 3 days trying to get my phone working with my sister's WiFi. The little card from the back of the router had this printed on it:
1 Select your wireless network:
PLUSNET-XXXXXX
2 Enter your wireless password/key:
3
Password
And finally I noticed what the problem was. The instructions on the card were actually:
1. Select your wireless network:
PLUSNET-XXXXXX
2. Enter your wireless password/key:
3rest-of-password