My LG Optimus F6 is a MetroPCS phone, with T-MOBILE SIM. So I was nervous it wouldn't work. Especially after the second code I tried didn't work. The 3rd code worked! It cost me $15. Only ten minutes to receive codes in e-mail.
Tip for consumers: I recommend researching your phone to make sure it is compatible with your service. In my case they were both LTE, some are GSM only.