That is probably who they have roaming agreement with. When I used it in Nigeria last week, it would only register on 1 of the 5 networks there. It did work ok however.
Quote:
Originally Posted by adam917
Just received my Global Roaming SIM (I'm in the US). Why is it prohibited from registering on either of AT&T's networks? I can register on only T-Mobile.
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Phones: Xiaomi Mi Mix 2, Samsung Galaxy A50, ASUS zenfone 3,
Sim cards: AT&T (Contract), 3 UK, Piranha Mobile