Bad news, power-users: if you habitually root every smartphone you put in your pocket, you won’t be able to use Samsung Pay. Users participating in the South Korean trialprogram have learned that devices with unrestricted access to the file system have been blocked from using the service. “Access denied,” reads the app’s error message. “Samsung Pay has been locked due to an unauthorized modification.”
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https://www.engadget.com/2015/07/24/samsung-pay-doesnt-work-on-rooted-phones/