If you are syncing your iPhone and want to make a phone call, you'll have to cancel the sync.
However, if you're already on the phone and want to sync and continue talking, the iPhone won't drop the call. So, syncing while talking is possible if you need to do it; just start the call before syncing.
There are lots of GPS applications for the iPhone which do live tracking of your position via GPS. Sadly, most of them don't work when the iPhone display is switched off. There are some exceptions, though. The newest release of RunKeeper Lite seems to include a workaround -- according to their blog, the iPhone display can be switched off and tracking still proceeds. Trails.app includes a nice display dimming feature, which switches the display off automatically when put into the pocket.
At least for some other applications, the following hint might be useful: If you start playing music with the iPod application, then open your GPS application and start tracking, you might be able to switch off the display with the lock button without losing tracking capability. If you turn the volume down, you won't hear the music. This may not work in all apps, so just give it a try.
The preferences for the iPod program on the iPhone/iPod touch does currently have an option to hide compilations from the Artist's view. If your artist list is also filled with these entries, and you're annoyed by that, the first thing to do is probably to tell Apple about it.
As a temporary work around, create a Smart Playlist that contains only compilation tracks -- simply set Compilation to is true in the Smart Playlist setup. Next, select all tracks in this Smart Playlist, open the Info dialog (Command-I), go to the Sorting tab, and enter a special character (e.g. . or #) into the Sort Artist field. After synching, all compilation tracks appear at the end of the artist list (of course, in both iTunes and on the iPhone/iPod touch).
I got this tip from a post from "discostevie" in this thread on the Apple Discussions site.
As you're probably aware, the iPhone is supposed to learn new words as you correct its suggestions--each time you click the 'x' box to reject a spelling suggestion, for instance, the iPhone should be noting that behavior. At some point, it will then stop suggesting an alternative when you type that word again. However, for some people (including me), it seemed this training wasn't working. I was using Notes to do my training, as it seemed like the most logical spot to do a lot of typing.
However, it turns out that that's a very bad spot from which to try to train your iPhone. Ars Technica's Erica Sadun explains why in this entry. Using a jailbroken iPhone, Erica was able to see that the customized dictionary was never updated when she typed new words in Notes. So basically, any attempt to train in Notes would be futile.
She then switched to Mobile Safari, and found that when she entered new words in the Google search box, they were immediately added to the dictionary file. In short, not every app on the iPhone seems to be capable of modifying the custom dictionary, and Notes is one such app. So if you're trying to add words to your iPhone, give the Google search box a try instead, and check out Erica's original post for more gory detail on this 'ducking iPhone' problem.
If your iPhone is jailbroken, you can add any book that is in Mobipocket's PRC format to Kindle.app.
The file needs to be placed in Kindle's eBooks folder, which is found in /var » mobile » Applications » random_hash_number » Documents » eBooks. You'll have to find out what your Kindle.app's hash is by comparing it to the date you installed the application.
With the advent of Amazon's free Kindle application for the iPhone and iPod touch, readers who don't want to spend the bucks for an actual Kindle device can use their mobile device to read e-books.
While this is interesting, many readers don't want to read e-books on a small screen, or simply don't want to buy books that are not made of dead trees. However, you can use the Kindle app for something else: to get previews of just about any book an Amazon.com. (Currently, that's 245,000 books, according to Amazon.)
To do this, install the Kindle app on your iPhone or iPod touch, then set up your account. Go to the Amazon site, and find a book you're interested in. Click Send Sample Now to have a sample sent to your iPhone or iPod touch. When you open the Kindle app, sync it, and you'll get the sample. You can read a long-ish chapter of the book you're interested in -- much more than Amazon's Look Inside feature offers you.
So if you want to sample a book, use the Kindle app, then buy the book on paper; or, try an e-book to see if you like reading on your iPhone or iPod touch.
If you see or hear something you like in your iPhone or iPod Touch applications, then you can follow these relatively simple steps to obtain the desired content.
Open iTunes and switch to the Applications section of the sidebar. If this section isn't in the sidebar, go to iTunes preferences and click the checkbox for Applications in the General tab. Pick the app you want, Control-click on it, and select the convenient Show in Finder option from the pop-up menu.
I'm going to say this before the next step, just to emphasize it: Make a copy of the app you are going to work with! That way, if something goes wrong, you won't lose the original.
Control-click on the application in the Finder and choose Copy from the contextual menu. Switch to another folder and paste (Command-V) the copy. Once the copy is fully there (sometimes apps take a little while to copy), you'll need to decompress it. For this, you'll need Stuffit Expander or similar. Once that's installed, Control-click on the copied app and use Open With in the contextual menu to expand the file.
Delve into the folder that was just created, and open the Payload folder within that folder. You should see an app icon with a crossed circle over it -- don't open this! Instead, Control-click on it and choose Show Package Contents from the pop-up menu. Congratulations! You've made it in!
From there, simply browse around in the contained files and folders until you find what you want, and copy it to a separate folder elsewhere. It's best to Quick Look everything if you're a Leopard user.
As I had a hard time figuring this out, this hint may be of help to other coming into the same situation...
I had a number of kernel panics due to a bad RAM stick. By the time I figured this out, my iTunes library file was damaged; iTunes built me a new one. However, when I plugged in my iPhone, it lost all the applications from the App Store, along with their data.
Restoring the applications was easy, as the files were still in ~/Music » iTunes » Mobile Applications. One just has to drag them into the iTunes window, with Applications selected from the sidebar. On the next iPhone sync, iTunes copied them onto the iPhone
However, all the application settings and data were still missing. The up-to-date backup was of no help. One has to resort to an older backup from Time Machine or another backup system. The procedure is as follows:
Disable automatic syncing in the iTunes preferences under Devices.
Replace ~/Library/Application Support/MobileSync/Backup/abc123 with an older version from Time Machine. Note that abc123 is a very long alphanumeric key identifying to your iPhone -- make sure you get the right one, in case you sync with several phones or iPods.
Plug in the iPhone.
Control-click (in the iTunes sidebar) on the iPhone and choose Restore from Backup. At the end of the process, your iPhone will automatically restart.
You should be done at this point. Don't forget to turn automatic syncing back on (in iTunes preferences).
Let's say you have several email addresses, and you'd rather people send mail to only one of those. In a desktop email application, it would be logical to use the Reply-To setting to change the email address your recipients see as your preferred email box.
And while the Email Address line in the iPhone settings screen might seem a logical place to use the preferred address, this does not have expected results. Using this approach, Mail can become confused, and may send your corporate email via your personal account. The recipient will see your corporate address, but the message will show up in your personal Sent mailbox. Or it may not send at all, instead reporting that you have some number of unsent messages.
On an iPhone, and regardless of your preferred method for people emailing you, you must keep the Email Address line in each account set to that account's actual email address. Duplications will just cause headaches.
I haven't come up with an ideal solution, but as a workaround, try this. Because there's no Reply-To field, I suggest using a signature for all accounts that includes the preferred address.