Unlocking Samsung Galaxy J3 Prime Error

magenta5575721

    So my iPhone just recently broke and my buddy gave me his old Samsung Galaxy J3 Prime. I was with Verizon Wireless on my iPhone, but the Galaxy J3 is locked with T-Mobile. I've tried the unlock app and it's not working. Every time I try to use it, it says:

     

    "Failure in processing the request. Please reboot device and try again."

     

    I really need to use my phone for work, so if anyone could give me any advice on how to unlock it I would greatly appreciate it.

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