Unlocked phone - can't switch to Metro

So, I had a Galaxy S5 and sold it to a co-worker of mine. Before I sold it, I paid off the phone and whatever and now it's unlocked (previously on T-Mobile). The email I got from T-Mobile said that I basically put in the SIM card from MetroPCS (that's what my co-worker has), then something pops up and I enter the unlock code and that's it. That's where the problem began, though. Nothing popped up, so I went to the interwebs and tried searching for this problem and I came across a few threads and tried the remedies seen on those threads, but nothing worked - the phone still isn't picking up Metro signals. I tried creating a new APN twice, but that didn't work. I need help on how I can fix this situation because I know that the phone is unlocked, hence the email from T-Mobile and the SIM that he's trying to use is activated because he pulled it out of his phone which was working perfectly.

Thank you for any and all help!

This entry passed through the Full-Text RSS service - if this is your content and you're reading it on someone else's site, please read the FAQ at http://ift.tt/jcXqJW.

Unlocked phone - can't switch to Metro