auのiphoneは8以降がVoLTE端末。6s〜7はsimロック解除でVoLTEsimが使えるようになる。
https://web.archive.org/web/20201227165657/http://blog.daletto.net/au-iphone7-available-mvno/
SIM返却しない場合に罰金をとるMVNOを
まとめた人
https://web.archive.org/web/20201007170142/https://kakuyasu-sim.jp/change-sim-size
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