Q: I am not able to backup my iphone to Icloud because my wi-fi is greyed out on my phone. The wi-fi button will not slide to the ON position, therefore, Iam unable to backup my phones contents. What can I do?

Back up to your computer instead.  To do this, connect your phone to your computer, open iTunes, click on the name of your phone in iTunes, go to the Summary tab of your iTunes sync settings and click Back Up Now.  Also go to File>Devices>Transfer Purchases to transfer your apps and other purchased media to your iTunes library.  Finally, save any photo stream photos to your camera roll (open your my photo stream album, tap Edit, tap the photos, tap Share, tap Save to Camera Roll), then import your camera roll photos and videos to your computer as explained here: http://support.apple.com/kb/HT4083.  (You don't need to delete them from your phone afterwards unless you need the space.)

If you're getting another phone, be sure to delete your iCloud account and turn off iMessage, FaceTime and Game Center before doing so.  (See http://support.apple.com/kb/HT5661).

This is a support article on your wifi issue: http://support.apple.com/kb/ts1559.