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How do I unlock the FM tuner on my Straight Talk Phone?

I have discovered a way to use the FM radio on the Galaxy J3 Luna Pro without rooting it. First you need to download the Samsung Radio app. I couldn't find the app on the Google Play Store so I downloaded it from https://www.apkmirror.com/apk/samsu...o-1-0-release/radio-1-0-android-apk-download/ as an apk. When I try to run the app it immediately crashes. Then I figured out that the Samsung radio app also has a widget to use the radio that works, which is the easiest method. The other method I discovered was when I downloaded this other app called Secret Codes - MMI USSD, and still had the Samsung radio app installed . In the Secret codes app you should get a long list of codes to do different functions. So you have to scroll to the one that has the Samsung Radio app that you just installed then press call. Then some sort of radio testing screen should come up. Press the menu button on the top right and tap noise test. This screen is probably used to test radio frequencies but you can change the start frequency to the frequency of a radio station and the delay to something like 99999.
 
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