ISIS, the joint mobile payment venture backed by AT&T (T), Verizon (VZ) and T-Mobile, was previously set to debut in select markets at the end of September, but undisclosed delays continued to push the launch date back. According to a purported internal memo obtained by TmoNews, however, it looks as if the service will launch on a trial basis on October 22nd for select T-Mobile customers in Salt Lake City, Utah and Austin, Texas. In order to use the Mobile Wallet service, users will need a special ISIS SIM card that will be compatible with the Galaxy S III, Galaxy S II and Galaxy S Relay 4G. It should be noted that rooted devices will not support the service, just as rooted devices are unable to use Google Wallet. We’ve posted a second image after the break.

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Dan joins the BGR team as the Android Editor, covering all things relating to Google’s premiere operating system. His work has appeared on Fox News, Fox Business and Yahoo News, among other publications. When he isn’t testing the latest devices or apps, he can be found enjoying the sights and sounds of New York City.