Are you using the phone number that you had your S4 on? The line needs to be provisioned(have a IMEI #) of a LTE phone AND a LTE SIM card. Now all their SIM cards are probably LTE now but I had to have them make a IMEI change when I switched from my N4 to the Moto X to get LTE to work. This was mentioned on XDA also today.
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It got a brand new nano card from the store today. I also gave them my IMEI number and I watched him input into his system. Funny thing was...he had my very old Lumia 820 still setup, and I have had two or three phones since and then all worked just fine.
Maybe he got a digit wrong?? I may try to call later if I get time. With the bands on this phone, I am stumped why it wouldn't work.
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