What is a carrier-locked phone?
A locked phone only accepts SIMs from one mobile company, so another provider's eSIM won't connect. It's most common with phones bought on a contract abroad.
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iPhone: Settings → General → About → "Carrier Lock". "No SIM restrictions" means it's unlocked.
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Android: try a SIM from another company, or ask the company you bought the phone from.
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If it's locked, ask that company to unlock it before you travel.
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