Marv567, I would like to help resolve this issue if you are still having problems. First, we need to determine whether the phone or the FiOS router is causing the issue. Are you able to connect to other wifi networks on your phone? Are you able to connect other wifi devices (computers, etc) to your wifi connection? Resetting the network settings is a great troubleshooting step since it requires you to setup the wifi network again. As JimFitzgerald suggested, make sure to reboot your router as well. Soft reset your phone by pressing the sleep/wake button and home buttons for 10 seconds until the Apple symbol boots up.
If you are still having issues with setting up wifi and the phone is not able to connect to any other wifi spots, you may need to restore/hard reset your iPhone. You will need to make sure your device is backed up as this will erase all data. Attempt to setup as a new device and then try the wifi connection again.
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