I should mention that I have only used the new sim in the US and it does not use callback. If the website says callback is used in those countries you are visiting, then it's probably correct. You may want to shoot Telna Representatives a email/PM to verify.
Quote:
Originally Posted by squawk1200
Interesting, the Telna website states that callback is used in the countries that I plan on visiting... If callback is no longer a factor, all the better!!!
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Phones: Xiaomi Mi Mix 2, Samsung Galaxy A50, ASUS zenfone 3,
Sim cards: AT&T (Contract), 3 UK, Piranha Mobile