Just to confirm, the extremely-short-lived app "iTether" still works in iOS 7. (tether has the distinction of being the only app Apple ever allowed in the store whose sole purpose was tethering. All other tethering-enabled apps allowed tethering illicitly, not as the main purpose of the app.)
Still USB-only, though, and you must keep the app running and your phone on for it to work. (It will continue to work for a short time after you lock your phone, but not very long.)
Still USB-only, though, and you must keep the app running and your phone on for it to work. (It will continue to work for a short time after you lock your phone, but not very long.)