FlyerTalk Forums - View Single Post - iPhone: disallow specific carrier?
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Old Sep 17, 2017 | 7:29 pm
  #17  
TGarza
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If the iPhone is carrier unlocked, you can change the carrier selection from automatic to manual. This would prevent the international roaming unless you specifically select the carrier.

Our iPhones were carrier unlocked when we had a problem with an iPhone on our last international trip. The Carrier option appears below the hotspot option once the iPhone is carrier unlocked for iOS 10.3.3
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