Very true that a lot of newer phones, especially smartphones tend to not work well with some of these callback sims. However, that does not explain why all incoming calls to the UK number went straight to VM.
Quote:
Originally Posted by FBlack_111
glhs509:
I am curious what type of phone you were using. I had ring back problems a year ago on one of my phones. I took 2 phones with me then. Seems on one phone I had to send a text message to get a ring back. The trick is to send an SMS with just the phone number you want to call in it to 1234. No charge for the SMS. The SIM worked fine in my other phone.
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Phones: Xiaomi Mi Mix 2, Samsung Galaxy A50, ASUS zenfone 3,
Sim cards: AT&T (Contract), 3 UK, Piranha Mobile