I bought my first Android phone, the T-Mobile G1, in February of 2009. In February of 2010 I upgraded to the T-Mobile myTouch 3G, though the only reason I upgraded was because the call button on my G1 died, and it was cheaper to upgrade to the myTouch than to purchase another G1. Then, this July, I upgraded to the T-Mobile myTouch 3G Slide, the Slide standing for the full slide-out QWERTY keyboard (very similar to the G1′s) that the new myTouch featured.
So, I was on phone #3, but still hadn’t been able to do any screenshots, because that required rooting, something I wasn’t willing to risk doing. For the hell of it, I checked the Android Market, and came across the Screenshot app. According to the description rooting was required, but after reading a comment from a myTouch 3G Slide owner that said that he was able to take screenshots on his unrooted phone, I decided to install it and try it.
Needless to say, it works perfectly!
Hi! I'm Jenn, aka Tech Girl. I'm practically chained to my computer, and I love all things technology. I may not be an expert, but I certainly have interesting posts and tidbits of info to share! Psst... you can find my personal blog at 
I also use a screenshot app on my phone.
The title of this article should’ve been:
You CAN take screenshots on an unrooted myTouch 3G Slide!
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I’m still getting the “root access required” message =( did this not pop up for you at all?
Figured out a way to take screen shots on ALL unrooted phones: http://goo.gl/Go9Pk
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I, too, get the message “Screenshot only works on Rooted Phones” message when it first starts up, but it still works! It doesn’t work with “Shake the phone to take a screenshot” checked, but does work with the timer. I’m using it on an unrooted Motorola Triumph from Virgin Mobile! Thanks, Tech Girl! I would have never tried it if I hadn’t read this page!