There are two AutoFill options under Settings>Safari>AutoFill. One is Use Contact Info and the other is Names & Passwords. I have tried every combination of having one or the other or both on and have never solved this problem. Nothing has restored the prompt to save AutoFill information when logging onto a site for the first time and there is no stored information to recall next time. I checked Settings>Mail, Contacts, Calendars>My Info. It is correct and I do not see how it is responsible for the lack of the "Save" prompt even if it had an error.
Jim, to put it plainly, your "fix" is the same thing Apple telephone tech support tried and it did not solve the problem now, just like it did not solve the problem more than two months ago. It is after the failure of trying all manner of AutoFill settings as well as Private Browsing, clearing AutoFill (under the Names & Passwords toggle in Settings) and clearing Safari's History and Cookies and Data as well as many, many phone reboots that the what I believe what I was told on the phone by Apple tech support is true. That AutoFill in Safari has been disabled. So if there is misinformation about this issue, it is coming from Apple and it is supported by everyone who has tried "fixes" and still gets no prompt to save AutoFill data and therefore no AutoFill data to recall and spare the user retyping login info every time they log into a website that requires it.
If this issue is really a problem with user settings, then it is fixable and there would be iOS 6 iPhone users out there who can succesfully get a prompt to save login information the first time they visit a new website that requires login information typed via the virtual keyboard. Those of us who have not gotten this resolved would then need to know the exact settings, every one under every relevant heading, so we have a workable solution that we can apply to our iOS devices. I am just not convinced yet that we are all talking about the same problem or that the problem I am talking about has a working solution.