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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