i locked my phone with a passcode and cannot remember what the passcode was. I cannot download iTunes on to my work computer. What can I do to access my phone?

Welcome to the Apple Community.

You can't do anything without a computer. If you have access to a computer you will need your Apple ID and password to restore the device.

You will have to use a computer that can run iTunes and follow the procedure in http://support.apple.com/kb/HT1808

If you cannot access a computer, try visiting an Apple store genius bar and see if you can get them to help with the recovery/restore.