tivoboy also mentioned that he has used the same phone with the same UM sim before without any problems. Unless the sim was updated that caused it not to work in that phone any longer (very unlikely...) So, it's either human error or simply a network problem.
Quote:
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Originally Posted by AndreA
Simply your handset is NOT compatible with the callback system of a UM simcard. This is the classic error when a cellphone can't use the UM sim tool kit... you have 2 solutions:
1. use another handset
2. try to call through the Sim Menu' (call US from Italy/Um use +1 or 001)
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Phones: Xiaomi Mi Mix 2, Samsung Galaxy A50, ASUS zenfone 3,
Sim cards: AT&T (Contract), 3 UK, Piranha Mobile