Enable Rakuten Mobile SIM on iPhone 6s

Rakuten Mobile UNLIMIT IV, iOS11.3.1, iOS 13.3.1 or iOS 14.4
  1. iOS 13.3.1: the easiest. Everything is ready made.
  2. iOS 11.3.1: you are supposed to download .ipsw and make .ipcc by yourself.
  3. iOS 14.4: the hardest. You are required to jailbreak your iPhone.
    4. It worked for iPhone6s and iPhone7.
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