[Q] Weird problem with unlocked S4 LTE topic

Hi! first poster here.

I've just got this phone wich was recently unlocked from TELCEL MEX carrier. The weird thing here is that the phone work flawlessly with any domestic carrier sim cards, but not with my US T-Mobile sim card.

I've test this T-mobile sim card with other unlocked phones (Galaxy S4 i9500 and Alcatel Pop) here in México without problem, but in the S4 above mentioned asks for sim unlock code.

The cell phone is SGH-I337M with KitKat 4.4.2. and firmware CSC code TCE

Thank you very much in advance!