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.
I'm glad your buddy had an extra phone for you to use. In order to unlock it, you must meet the requirements found here: Unlock your mobile wireless device. However, it'll likely be much easier for your buddy to request the device be unlocked since he's a current T-Mobile customer.
Manage your T-Mobile account