What does a unlocked iphone mean in the simplest way?

What does a unlocked iphone mean in the simplest way? - 1

You can use a sim card from any network.

It'll allow to use it on any carrier of any country as long as they support the GSM bands the iPhone has.

While locked iPhone like locked to AT&T means it will only be able to use an AT&T SIM card, only be able to use their network, no switching to T-Mobile or Verizon or others unless you unlock it and if you go to another country, you'll have to use roaming and not be able to buy a local SIM card which is much more cheaper.

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