I've previously demonstrated how a Rebel Sim II card can be used for a temporary unlock (once the card is removed, the device returns to its original carrier/SIM-locked state) and we've already talked about obtaining the unlock code from AT&T, so now let's take a look at a piece of third-party software appropriately called Dell Streak Unlocker.
Dell actually stores the unlock code right on the Streak, so all the $29 Unlocker software really does is retrieve this code from the depths of darkness and brings it to light so that you can enter it into the screen that appears (shown above) when you insert a SIM from another carrier.
The software works with Windows XP/Vista/7 and automatically installs all the correct drivers to unlock any Streak running Android 2.2. I used it to unlock my AT&T-locked Streak (DJ_Steve's StreakDroid 1.8.0) on my 64-bit Windows 7 computer, and the process was quick and painless.
If you want to confirm that your Streak is unlockable before shelling out $29, you can download the software and try it out for free first. If the program determines that it can unlock your Streak, then you can purchase a registration code to get the code. In this way, the Unlocker team can guarantee that their product will work with your device.
Once unlocked with Dell Streak Unlocker, the Streak will remain unlocked forever, regardless of future software updates.
Although getting AT&T to give you your Streak's unlock code for free isn't the drawn out, hair-pulling process it used to be, Dell Streak Unlocker is still a good solution for your unlocking needs. Streak users who aren't AT&T customers, can't get the code for whatever reason, don't want to use a Rebel Sim II, or are using the Streak on another carrier that won't give out codes very easily could all benefit from the software. Check it out for yourself at the link below.