There are some pretty cool Android devices on AT&T now, including the Samsung Captivate, and the Dell Streak.  The only problem is, AT&T has decided to lock down the devices so that non-Android Market apps can not be installed.  Fortunately, there is a workaround for Dell Streak owners which does not require having to root the device.  Just follow the steps outlined below:

1. Dial *#*#307#*#* on your Streak. Other than a quick flash on the screen, it will look like nothing has happened.
2. Go to your app drawer/program menu and tap a new icon labeled EMList. If the icon is not there, turn off the Streak. It should be there when you turn it on again.
3. Scroll to the bottom and tap app_security.
4. Tap update unknown resource property to enable it.

Now, simply tap the Home button, press Menu, and go to Settings > Applications, where the “Unknown Sources” check box is now available.  That’s all there is to it!  If you ever want to reverse this, simply dial *#*#308#*#*.

[via IntoMobile]

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