A SIM card, or subscriber identity module, is a small card in your cellphone that lets you place phone calls, send text messages, and more.
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Agents seize 200K more SIM cards linked to foreign network: CBS
Federal agents have discovered an additional 200,000 SIM cards connected to a communication network in the New York Tri-State area.
If you need to find out your iPhone's carrier without a SIM card installed, you can do so through the Settings app.
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