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Display UTC on the iPhone's World Clock iOS devices
For some hobbies and businesses, it's necessary to use Coordinated Universal Time or UTC, which is similar to Greenwich Mean Time (GMT). The iPhone World Clock can display several separate clocks, so I thought it might work to add London as a substitute for Greenwich, which was not listed. But on a lark I typed utc in the search for city dialog, and it came up! Once selected, I had a clock dedicated to UTC. This is better than using a nearby city, as it should avoid problems with daylight saving time changes.
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Use two Gmail accounts to manage iPhone email iOS devices
I am an avid Google Mail user, and recently purchased an iPhone (how couldn't I, after seeing the SDK demo). I configured the iPhone Mail app to use my Google Map IMAP account. Works like a charm, but, a lot of times I want to send reminders home from the iPhone. Obviously I'd see those mail on the iPhone as well. Too much information. So here is what I did:
  1. Set up a new Google Mail account -- username.iphone@gmail.com.
  2. In my main Google Mail account (username@gmail.com), I set up a filter like so ... in the 'Doesn't have:' field, I listed subject: -iphone, OR, from: -username@gmail.com. On the next page, enable Forward it to: username.iphone@gmail.com.
  3. On the iPhone, I created a new Mail account, but used the username.iphone@gmail.com as my main account. (I can still access the other gmail accounts through Google Mobile, just in case.)
  4. On the iPhone, I changed the outgoing SMTP server to username@google.com. That way, mail I send from my iPhone look as if they come from my main mail account.
Using this setup, the following mail will arrive on the iPhone:
  • Any mail I send from another mail account (the office), as long as it doesn't have -iphone in the subject line.
  • Mail I send to username.iphone@gmail.com
For me, this is pretty much perfect, as it keeps my iPhone mail account pretty clean without losing out on important mails. Of course, adding more OR entries to the filter will allow for even finer control on what to let through to the iPhone.
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Make iPhone, Apple Mail, and GMail POP work together iOS devices
I was really sick of POP GMail and the iPhone not just working. I found several types of hints online, and none would really work for my situation. I use POP on GMail so that I can get mail on my Mac and leave a copy on GMail's server for archive and search purposes, which I do endlessly. The subtle implication here is that I have about 2,500 messsages in there.

So I set up the iPhone and was all excited when it just took my accounts from iTunes and set them up. But I noticed one thing: even if I had Recent on, for some reason, my Mac and my iPhone would race to download a message and if one got it, sometimes the other did, and sometimes it didn't. I confirmed this to happen to other people via many furious and frazzled searches waaaay past my bedtime.

Another thing I found was that I'm not a super great typer on the iPhone yet, and there were some messages I'd want to read on the iPhone but respond to on my Mac. In short, for a lot of reasons, it wouldn't bother me to have messages on my GMail, on my Mac via Mail, and on my iPhone.

Further, even if I got some messages to actually find their way to the iPhone, I could read them okay, but when I deleted them, the iPhone politely asked me if I would like to load the next two billion -- I'm not exaggerating, it really said that -- messages. I found this to be a documented problem and, frankly, I was disgusted. Well, I figured out away for everyone to just get along:
  1. Set up a new account on GMail. For this, I just added a "1" to the end of my existing GMmail account. Make sure you have POP enabled.
  2. Make your current GMail forward to that address.
  3. Add a new account on the iPhone, but click Other instead of GMail when setting it up. Now enter in your new GMail account info, but on the outgoing server, put in smtp.gmail.com with your old GMail account.
This way, you will receive an email any time one pops into your GMail account on your iPhone and on your Mac (provided you already had your Mac setup how you wanted it). Also, when you respond to an email, it will appear to come from your regular GMail account since you used that outgoing server. Now everyone can play happily together!
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Choose international domains on the iPhone keyboard iOS devices
You probably know already that you can hold down a key on the iPhone keyboard to select international versions of a character (eg. Accented characters) I have just found that this also works for the .com button on the Safari version of the keyboard.

Hold down the .com button, and you will be able to quickly select the regional domain suffix for whatever international language keyboard you are using. Eg .co.uk for the UK keyboard, .de for German, etc.
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Simulate gestures in the iPhone Simulator iOS devices
You can simulate the 'pinch to zoom' gesture of the iPhone in Apple's Aspen Simulator by holding down the Option key while clicking the mouse in the area you wish to pinch. This brings up a pair of dots that represent your fingertips.
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Better/continuous scrolling on iPhone/iPod Touch iOS devices
When you are zoomed in to read, for example, a column of text in Safari on the iPhone and iPod Touch, it can sometimes be hard to scroll in a straight line without accidently scrolling left and right. I found this quite frustrating until I changed the way I was scrolling.

The important thing is the direction you start dragging in when you scroll. If you move only vertically then the scroll becomes vertically locked and will not scroll on the horizontal axis until you next lift your finger. Conversely, starting a horizontal drag locks scrolling horizontally. The problem is that it's too easy to start off on a diagonal and drag the column you're reading sideways.

If you scroll by running your thumb along the very edges of the screen then you can always be sure you're moving in a straight line and you won't suffer this anymore. This has the added benefit of keeping your view of the screen uninhibited since your thumb can be practically off the display entirely. Additionally, it's possible to scroll a long page like a forum thread continuously by starting a new drag with the opposite thumb even before you reach the top or bottom of the screen.

I created a short video demonstrating this scrolling method, in case you'd like to see it in action.
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Launch iPhoto only on camera, not iPhone, connect iOS devices
I have been continually annoyed with the way that iPhoto would start whenever I plugged my iPhone into my computer. The only pictures I take with my iPhone are to help me find my space in a parking lot, or so I can reassemble something I am taking apart. I do not want to archive these pictures. However, I do still want to use iPhoto to take the pictures off my digital camera. My previous solution was to set Image Capture to disable launching iPhoto in every case of camera attachment, and then manually launching iPhoto when necessary.

Luckily, Sam Stephenson at 37signals provided me with a solution that will launch iPhoto when a camera is attached, but not when my iPhone is attached. Sam realized that within the preference pane of Image Capture, an arbitrary application can be set to launch whenever a camera is connected. This solution utilizes the shell command ioreg combined with grep to search through the USB devices connected to the computer.

The script is able to sort through the connected devices and see if a specific device is connected. If that device is connected, iPhoto will be launched. Since the application is set to run whenever a camera is connected, it provides a method of sorting between the iPhone and a digital camera. Sam does a really great job of explaining every step for those not proficient with the terminal or scripts.

While this is quite useful as is, I wanted a slightly more generic form. I wanted to launch iPhoto for every camera that was connected, but never for my iPhone. Instead of searching the I/O Kit registry for a specific camera, I decided to search for any entry containing the word Camera.
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Change root passwd on iPhone 1.1.3 iOS devices
I have never tried using the passwd command on my jailbroken 1.1.3 iPhone, since everyone warns of its use. However, I don't like having the default root password that everyone in the world knows, so I wanted to figure out a way to change it. It's pretty easy actually. On a Mac or Unix/Linux, the openssl command will do what you need like this:
openssl passwd -crypt -salt /s myNewPasswd
The password can only be eight characters long; anything longer will be truncated. I don't know if the salt has to stay the same or not, but to be safe, I just used the same salt as the original password. I doubt this makes any difference, though.

I ssh'd to the iPhone, and ran cat /etc/master.passwd, then copied that output to BBEdit (or other text editor). Then I replaced the passwd section (in between the first two colons) with my new hash for both root and mobile users. Finally, I copied the whole thing, switched back to the iPhone's ssh session and ran:
cat > /etc/master.passwd
I then pasted in the clipboard contents and pressed Command-D. That's it; the password was changed. I ran through most of my apps, put the iPhone to sleep, woke it up, and rebooted all without any problems. You don't need to reboot or do anything else for this to take effect.

[robg adds: I haven't tested this one.]
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Watch slow motion video on the iPhone and iPod touch iOS devices
If you want to see something in slow motion -- either on YouTube or your videos in the iPod section of the iPhone -- here is something for you. Make sure your video is paused, then just tap and hold rewind or fast forward, and your video will begin to play in slow motion.

[robg adds: I could make this work for the forward direction on my 1.1.3 iPhone, but not backwards. This slow motion feature isn't noted in the iPhone User Guide anywhere that I could find. By the way, Apple updates the iPhone User Guide somewhat regularly; the third revision was released at the end of January. As an interesting aside, it seems Apple optimized this latest version; it's about 4MB, versus 10MB for the first version -- and it's actually longer and has at least as many images as the first one.]
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Fix attachments not loading in iPhone's Mail app iOS devices
I found that attachments fail to download once the iPhone's scratch disk is full. So when you fail to receive a critical voicemail or document, just reboot -- rebooting the iPhone clears the cache (I think it's 500MB in size?).
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