Actually, it's still not a bad idea to test it. Even though they list free call forwarding as included, you never know when thay may change and start charging for it. Usually they will inform users before doing so. I actually tested mine with several destinations (including my united mobile #), just to make sure it's free. Every destination I tried except UM (connected about 50% of the time) connected 100% of the time. When I am in the US my IOM sim stays forwarded to my US mobile, so that my family in UK can reach me out of the included minutes on their mobiles.
Quote:
Originally Posted by PhotoJim
Oh, never mind. I see that you know you have forwarding. 
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Phones: Xiaomi Mi Mix 2, Samsung Galaxy A50, ASUS zenfone 3,
Sim cards: AT&T (Contract), 3 UK, Piranha Mobile