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I have a T-Mobile SIM that, on a OnePlus One, works perfectly fine on T-Mobile's APN in IPv4-only mode, with an IPv4 address and everything.

However, when I take it out and put it on a OnePlus 5, it doesn't work with the same APN settings unless I change IPv4 to IPv6 (or IPv4/IPv6).

I'm baffled at how this is possible. How is this possible? Shouldn't all phones be able to connect to the same APNs with the same settings?

  • T-Mobile in what country? – Michael Hampton Feb 1 '18 at 19:05
  • @MichaelHampton: USA. – Mehrdad Feb 1 '18 at 19:30

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