I know the carriers in Japan support VoLTE. In fact a US competitor to T-mobile announced that their roaming agreements with one of the carriers in Japan included support for VoLTE. I didn’t see a similar announcement by T-mobile which makes me think it doesn’t have a similar agreement with carriers in Japan.
e.g. see https://www.reddit.com/r/tmobile/s/HKq7UikSlR
I've already done that using the kimovil website. For the iPhone 13 mini- 2G is 0 for 2- 4G is 10 of 12 depending on carrier.Otherwise I know the iPhone 13 mini supports VoLTE. But VoLTE depends on the roaming agreements that T-Mobile has in place with the Japanese carriers. I suspect T-Mobile doesn't have such agreements with them. Looking for somebody to confirm. Thanks!
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