Your card's role can vary, depending on the type of cellular company you work with. You may not remember buying a SIM because it typically comes inside your phone when you buy it. ![]() What Is a SIM Card?Ī SIM card is a tiny piece of metal and plastic that sits inside your smartphone. If you didn't remove your subscriber identity module (SIM) card, you might have missed a key step. ![]() That means you've probably traded your device at least once.īefore you sold, you probably copied your photos and contacts. ![]() On average, we keep our smartphones for about 22 months before we trade up to a new model, researchers say.
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