International Sim Card Support
How do I know if my iPhone supports International Sim cards?
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All iPhone models are world phones, so you can use them almost anywhere. Whether you are a GSM or CDMA network customer, you can roam internationally on GSM networks in over 200 countries or regions around the world. Availability of LTE data varies in some countries or regions and depends on carrier support for certain LTE radio frequencies. Contact your wireless carrier for more information regarding international roaming policies and rates.
The iPhone needs to be unlocked and SIM-free. Ask the agency from whom you intend to buy.