Without a SIM card your phone doesn’t exist on the cellular network and with it, your phone’s “identity” is known whether you’re in Kuala Lumpur or Miami Beach. What’s a SIM card? I knew you’d ask that! A SIM card is a subscriber identity module and it’s the tiny little plastic card buried deep in your cellphone, whether a super smart Galaxy S7 or iPhone 7 or a simpler phone like an LG Xpression. A PUK code is a personal unlocking key and it’s tied to your SIM card.
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