2013-03-13 Minimize cellular usage on iPhone

There's a number of guides on the internet that talk about minimizing cellular usage. Often, they go into generalities, like "don't watch streaming video". Well, duh. I'm not going to offer general tips, but instead list a few settings for the iOS and some popular apps so your iPhone (or iPad) prefers WiFi whenever possible.

In the Settings app:

• iTunes & App Stores -> Use Cellular Data -> OFF
• iCloud -> (several settings) -> OFF
• Mail, Contacts, Calendar -> Fetch New Data -> Manually
• Music -> iTunes Match -> OFF
• Music -> Lyrics & Podcast Info -> OFF
• iBooks -> Sync Bookmarks -> OFF

Separate apps:

• Podcasts: do not use this app; it has a setting to only use WiFi, but seems to have a bug in this feature
• Instapaper: tap Settings -> Advanced -> Update -> On Wi-Fi Only
• Evernote: tap Evernote icon -> tap username -> General Settings -> Sync on WiFi only

There's some things I'm not sure whether they use cellular data, but I'm listing them here:

• In the Settings app: General -> About -> Diagnostics & Usage -> Don't Send

Edit: there's a much better, much longer list here:
TidBITS: What’s Behind Mysterious Cellular Data Usage in iOS 6?
TidBITS: Mysterious iOS 6 Cellular Data Usage: A Deeper Look