iOS 4.1 Field Test Mode 信号实地测试模式

iOS 4.1重新加入了实地测试（Field Test）模式。实地测试模式可在传统的信号栏计量之外以具体数值显示信号强度。

进入此模式的步骤是：
首先，将iPhone升级至iOS 4.1
拨打*3001#12345#*这一号码

按Home键将退出实地测试模式。此前Anandtech网站曾就信号格与实际信号值的关系展开客观讨论。文章发表后，苹果相应对信号栏的显示比例作出了调整。Anandtech之后报道，他们惊奇的发现，iPhone在信号强度低至-113db（负数越大信号越弱）时，仍能保持通话状态。

尽管大多消费者并不关心信号强度数值，但在iPhone 4发布初期，由全新天线设计引发的信号强度浮动曾引发公众极大关注。

Solution to iPhone 3G take long time (Hours) to backup/sync

http://blog.jhong.org/2008/08/does-your-iphone-take-forever-to.html
searched around the web and found this.. worked like a charm! Enjoy :)

http://www.hackint0sh.org/forum/showthread.php?p=340389

"Extraordinary long backups are caused by an error when an app (or apps) was installed or updated, particularly if you have ever installed or updated using the App Store on the device itself rather than iTunes. Even if you were never aware that there was a problem, they can arise and will cause problems with the backup process. Maybe you did have a problem during an update or install. Maybe the update stalled, or the App Store crashed. These issues are very likely what have been causing your long backups and you didn't even know it. During the backup process these errors cause it to drag and pause for a very long time before it gets moving again. From your view, you just see a normal backup that is taking hours, and undoubtedly annoying you to no end. On the inside, iTunes is trying desperately to get past a roadblock that it doesn't know where it came from.

This is how to fix the problem. This is not a quick fix, but it is an effective fix. And it is a FIX, not a band aid. Depending on how many apps you have installed, this can take several hours to complete. You will also lose all game scores and any other data stored in your apps. You will be starting fresh. It is an inconvenience, but in the end, you will be rewarded with quick, efficient backups, the way Apple intended. And you will never have to dread the
iTunes backup again.

The Process:

1. Open iTunes, go to Edit>Preferences>Syncing and remove all previous backups. Also click "Disable automatic syncing for all iPhones and iPods"

2. In your system file structure, locate the backup files for iTunes.
On Windows: C:\Documents and Settings\USERNAME\Application Data\Apple Computer\MobileSync\Backup
On a Mac: Users/YOURACCOUNT/Library/Application Support/MobileSync/Backup
Delete ALL files and folders inside the Backup folder.

3. Plug in iPod. On the Applications tab, uncheck sync apps. iTunes will ask if you want to remove the apps from the iPod, say yes. Click sync. This will remove all apps on your iPod, it will also backup the ipod. This backup will be very fast, and will recreate the backup folders you deleted in step 2.

4. After the sync is complete, if there are any apps left on your ipod, touch and hold the icon until it starts to wiggle, then touch the X to delete the app. Delete all apps left on your ipod. Then sync again.

5. After the sync is complete, disconnect the iPod and do a hard restart by holding down the sleep/power button until the slider appears, slide to power off. Wait 5 seconds and push the power button again and wait for the ipod to boot up.

6. Connect your iPod again. Now begin adding apps back to your ipod one by one. On the Applications tab, click "Sync applications" AND "Selected applications". Make sure all apps are unchecked.

7. Check one app and sync. After the sync is complete, right click on your ipod under Devices in the left column of iTunes. Click "Back Up" and allow the backup to complete.

8. Repeat step 7 for each app you want to install. Keep the previous installed apps checked, just check one more app each time. Be sure to backup after each install. As you add more and more apps, the backup will take longer and longer as the process scans apps for changes. An initial backup can also be long for a particularly large application. However, ONLY the initial backup after you install an app will take a long time. Subsequent backups are very quick. Even these "long" backups are just minutes long, sometimes up to 15 minutes in my experience.

9. When you are finished installing and backing up all apps, go to Edit>Preferences>Syncing and enable automatic syncing for all iPhones and iPods.

10. Unplug and plug your device back in just for kicks. Let it back up and sync. Better?

Notes:

The very first time an application is backed up, all critical data is written to your hard drive. This is why the backups are so long the first time. Afterward, only data changes are written, so backups are much shorter.

Backup times will continue to vary based on how many apps were altered since the last sync. If you've used one app since the last backup, your backup will be very short. If you've used 20 apps, the backup will be longer. But you will be rid of the dreaded hour (or more) long backup, that is a promise.

Now that your apps are installed and backing up correctly, the number one rule is to never, ever install or update apps through the App Store on the iPod. ONLY install and update through iTunes, and backup after every install or update. The App Store on the iPod is still unstable and can cause lock ups, crashes and freezes. And it is the culprit in these long backup times. Avoid it until the bugs are ironed out.

Also, do not be tempted to disable backups using programs or code edits available online. Your backups are crucial in the event of a restore. Backups contain all of your personal data like game scores, notes, icon arrangement, application data, etc. And it's not a matter of if you'll have to restore one day, it's when, and you'll be glad you have a backup when you do."

一个iTunes只能对5台电脑授权?重装系统怎么办?(答案)

官方说明
http://support.apple.com/kb/HT1420?viewlocale=zh_CN&locale=zh_CN

所以如果您已授权的电脑少于 5 台，或者您在过去 12 个月内使用过该选项，则“全部解除授权”按钮将不会显示。
但也有人说
"一年内满了5台电脑重置自动会出来
但这一年又满了5台的话重置还是会出来,还是会让你重置
所以完全不用担心授权问题.除非你是真的有6台或以上的电脑要同时授权"

so,any comments?

Workaroun for internet security camera email (smtp) setting (my Trendnet IP422W)

the camera email test page prompt that: "Error: Email sending failed" (gmail, yahoo...)

My guess is that your camera, like most, doesn't provide SSL (secure sockets layer) encryption. Most e-mail providers that allow SMTP connections require this.
You'll have to download a tiny program, called Stunnel (thank you to the fine folks who created this and made it open source; the world owes you!) Here's the link to the .exe files:
http://www.stunnel.org/download/binaries.html
Install it, and open the file "stunnel.conf" in notepad. You don't need most of the stuff in there, so you can comment out the protocol for pop3 and imaps. You will need these lines:

client = yes

[ssmtp]
accept = 465
connect = smtp.gmail.com:465

"Accept" is the port that your camera sends the e-mail with (remember, an IP camera is actually a tiny computer). After you make these changes, run Stunnel (you can also set it to run as a service so that it starts every time Windows does.
"Connect" is the email server you want to connect to and the port that it accepts e-mails on. I've used gmail and it's default port in this example.

You're not done yet, though. You'll have to change the server in your camera settings from gmail's to the IP of your computer. Why? Because you'll need to send the e-mail from the camera to your computer first, where Stunnel will grab it and reroute it securely to gmail. If you don't know your computer's IP, grab it using ipconfig from the command prompt (available under Accesories in the Win XP start menu.

It works for me, at least !!

Workaround for iPAD "Unable to purchase" when updating Apps

I think it was a EULA issue . I simply reset my iPad by holding the home and power buttons, then sliding the on-screen power switch that appeared. I let it boot down for a couple of minutes, fired it back up and retried my AppStore download. The software asked me to accept the new licensing agreement and it worked from there.

How To Check Mac OSX Version

Step 1: Find Your Mac OS X Version

The first step in securing your Mac is to know what OS version is installed. Although portions of this document are applicable for older Mac OS X versions, this was written with Mac OS X 10.5 and 10.6 in mind. Use the following steps to find your Mac OS X version.

1. From the Apple menu, select About This Mac.
2. The version number will appear in the window.

How to upgrade the MacBook Air (MBA) to Snow Leopard (Mac OSX 10.6.xx)

I have to say that my experience upgrading both my Macs to Snow Leopard has been mixed. It was easy as clicking the Install button on the iMac, it was a nightmare on the Macbook Air.
First I used the Remote CD installation process, started the Macbook Air, mounted the remote CD from the iMac and proceeded to run the “Install Mac OSX.app”. After agreeing to the license agreement the installation utility told me that the disk did not have enough free space. Despite the fact that the disk had 21Gb of free space!
After some digging I found out that PGP Whole Disk Encryption is not compatible with Snow Leopard, and PGP advised users to decrypt the disk before upgrading.
So I decrypted the disk and restarted the Installation process, only to find out a new error! Damn.
The install app now told me that the Machintosh HD, the only disk, in my Macbook Air, was not a bootable disk and could not install to it. I did some more web searching and some people reported the error to related to the partition format, not being GUID.

I checked with Disk Util and it was indeed GUID. So using Disk Util I added a new partition with 1Gb, using the free space, this procedure rewrote the new partition table to disk and after I was able to finally install Snow Leopard.
When Snow Leopard was installed I used Disk Util again to delete the 1Gb partition and recover the disk space.
If Disk Utility gives you disk verification errors, you need to repair those before resizing your partitions. If you repair the disk multiple times and it still gives you the same errors then you should run the Remote Install Mac OS X application on another Mac. If you only have a Windows as a second computer check this the “How to use Remote Disc” article on Apple’s support site.
Boot your MacBook Air directly into the Snow Leopard CD. Just start the Air and hold the option key until you see the list of disks you have to boot from. If the Remote Install Mac OS X application is running on your other computer the Snow Leopard will show up here.


source: http://bigdiver.wordpress.com/2009/09/08/upgrading-the-macbook-air-to-snow-leopard-mac-osx-10-6/