Did you try my suggestions above.
You definitely do not want to call CS using the UM+ sim (or anywhere else for that matter) from the US. It's insanely expensive! Check the rates page for exactly what that will be.
Quote:
Originally Posted by Nukesafe
Good suggestion, Prion. It would be a lot easier to call the customer service if I could dial out!
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Phones: Xiaomi Mi Mix 2, Samsung Galaxy A50, ASUS zenfone 3,
Sim cards: AT&T (Contract), 3 UK, Piranha Mobile