Samsung galaxy s6 edge No longer network unlocked

magenta3067391

    I need help, I bought a Used Samsung s6 edge, the previous owner went ahead and contacted t mobile to use the device unlock app..Everything was working fine .the phone was unlocked for like a week and now it says invalid sim ..network locked sim card inserted...When i try using the device unlock app..it says device already permanently unlocked....please any help would be great

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