Is there a way to change or choose the carrier my iPhone 5 uses while I am travelling internationally?
I have a US iPhone 5 and want to be able to choose a specific carrier while travelling overseas.
You could just purchase a go pre-paid phone or gophone with a Nano-SIM and swap its SIM into the iPhone.
See this Apple doc for other options/information -> iPhone and iPad: Using cellular networks while in another country
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