[HTC Rezound] SynisterWolf:
tried all 4 codes on my htc rezound. nothing happened.

so im sorry but it looks like you are miss informed.

The Factory Reset. One of those last ditch efforts that many of us have a fair bit of experience with. However, a malicious embed code could potentially do the exact same thing to your Galaxy S III. The Unstructured Supplementary Service Data (USSD) code (which we won't reproduce here)

apparently only works on Samsung phones running Touchwiz, and only if you are directed to the dodgy destination while inside the stock browser

(rather than Chrome, for example). This means the Galaxy Nexus is unaffected, but it can work the same dark magic on the likes of the Galaxy S II.

We've been trying to murder a (UK-based) GS III here at Engadget, but with no luck as yet -- we can cause the malicious digits to appear in the dialer, but we can't force the stock browser to visit them as a URL, even when trying a bit of URL forwarding and QR code trickery. However, this particular GS III has been rooted in the past, even though it's now running an official TouchWiz ROM, and that may be interfering with the process.

Aside from our own experiences, the evidence for the vulnerability is certainly strong. It was demonstrated at the Ekoparty security conference last weekend, during which time presenter Ravi Borgaonkar also showed how a different code could even wipe your SIM card. See the video after the break for the evidence.

Update: Tweakers.net has been able to replicate the security hole on a Galaxy S Advance, while The Verge has confirmed that it works on both the Galaxy S II and the AT&T Galaxy S III. Samsung has told us it's looking into the issue.

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There's a lot of confusion as to exactly which Samsung phones are vulnerable to today's big scary USSD vulnerability, which could cause some phones to factory reset themselves upon visiting a malicious web page. Some Galaxy S2 and S3-class phones are susceptible, others less so. In some cases it depends if you're running the latest firmware or not. In others, there's no patched firmware available yet.

Samsung will surely be hard at work rolling out fixes for devices that remain susceptible, but in the meantime we've got a quick, easy to tell if your phone is at risk, without taking the plunge and running the malicious code itself. Find out more after the break.

First off, note that today's glitch only affects Samsung phones. Our testing method may produce different results on other manufacturers' devices, but it's important to remember that it's impossible to use this exploit on a phone that's not running Samsung's TouchWiz software. Also, note that we don't see any secret information from your phone during this test. If in doubt, right-click and check the source code to see exactly what we're doing. It's a pretty simple test.

With that in mind, head to this page on your Samsung phone's stock browser. You'll find it at androidcentral.com/ussd-test

With this page loaded on your phone, simply click the button in the embedded area below to see if your Samsung phone is at risk. The test works by trying to direct you to a benign USSD code, specifically, the one that displays your IMEI on your screen (nothing malicious). If you're using a Samsung phone and a window pops up showing your IMEI number, you're likely vulnerable. If your dialer just loads up showing either nothing, or *#06# in the number read-out, you should be safe.

Let us know how you get on down in the comments. Safe browsing, everyone!

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