- If you encrypt your iOS backups then your credentials will be backed up (otherwise you need to reenter them)
- Prevent iPhone from trying to correct a word or phrase: Create a shortcut, but leave the Shortcut field blank.
- Siri (the user guide has more detail than I've seen in any article, FAQ or book)
- To cancel a request and start over the magic word is "cancel". (I couldn't find out how to do that last Feb)
- Remember to tell Siri which Contact is "you". (I thought I had, but it was null). Add phonetic pronunciation of unusual names. Add relatives (wife , mother) and kids. Add work address. Add distinctive nicknames for people who are hard to pick out from the crowd. (This enables things like: "Remind me to call my daughter when I leave the office")
- When you start using Siri listen for two quick beeps. That means she's listening.
- If Siri doesn't respond when you bring iPhone to your ear, start with the screen facing you, so your hand rotates on the way up.
- Headset call button: press and hold. To continue a conversation with Siri, press and hold the button each time you want to talk
- If want Siri to relearn your voice, turn it off and on (this can help if Siri is persistently unavailable too, easier than a full communications reset)
- Training Siri
- use headset you use in car and without
- don't talk into bottom of phone
- make a bunch of requests and correct: tap on Siri description
- If documents and data are enabled iCloud will share your personal dictionary between devices. (Don't know if it will share Siri speech files.)
- Dial pause: press and hold *
- Dial wait: press and hold #
- Last number redial: tsp call
- Conference calls to five are GSM only. Call forwarding and call waiting may be GSM only too.
- FaceTime: you can move your local image around the screen.
- Get voicemail when visual voicemail isn't available: Dial your own number (with CDMA, add # after your number), or touch and hold "1" on the numeric keypad.
- Change the indentation (quote)level: Select the text to indent, tap the right arrow icon at least twice, then tap Quote Level.
- In iOS 6 there are a lot of interesting advanced options for email, some of which make Gmail less awkward.
I suspect there are at least as many gems in the rest of the very well done manual. I wonder if anyone else has ever read it (excepting book authors).
 http://manuals.info.apple.com/en/iphone_user_guide.pdf I read the iBook version.
 Siri can't understand Emily's last name, but 'my wife' she gets. If I say "my son" I get a list of all my children (sons and daughter) and it's easy to select one. If I say "friend" then Siri scopes the search to friends in my contact. These tricks help when you have large numbers of contacts (ex > 1,0000).