plenty of solutions here, despite not knowing what the problem is ...getback do you have any other wifi devices using your router at the moment?
can you see your wifi network name listed on the phone? and does it have a padlock symbol next to it?
Yes and yes!
^ good! the next step is to change your wifi password on the router, then enter the new password on your phone
the router itself has a pw so you can access its settings via the webpage. the wifi will have a separate pw, this is what you want to change. then try to join with your phone using the new wifi pw.
what model router is it exactly?edit: and do you have the manual?edit2: just seen a 2wire manual, the default wifi password is an 8-digit number in brackets on the bottom of the router (eg. [12345678]), enter it without the brackets
I am no specialist in Apple products, but after reading the 2wire manual I found an interesting thing on page 9. It tells how to configure the wireless in Apple AirPort and the trick is to enter "$" followed by the ten digit encryption key. Could that be an Apple standard, including iPhones? Just a wild guess, but doesn't hurt trying.