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iPhones on T-Mobile do not use 464XLAT, they use native IPv6 only. Some system frameworks like URLSession can do the NAT64 translation of hard-coded IPv4 addresses but it still goes over IPv6. In the video linked above: https://youtu.be/nNMNglk_CvE?t=1651

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Precisely what I meant is that unless you use very low level networking functions in your app, you will have no problems with that requirement even if your server is ipv4-only, as is my case.

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