My smartphone suddenly won't work! What is a PUK code? A smartphone pitfall that even older guys should know about

When using a smartphone, you might suddenly see an unfamiliar message displayed.Please enter your PUK code....What on earth is a PUK code?Is my smartphone broken? Or should I just enter my usual ...
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Airtel SIM locked? Unlock it easily using PUK code with these simple methods

Airtel SIM Unlock Guide: If your Airtel SIM card has been locked after multiple incorrect PIN attempts, there’s no need to panic. Telecom operators provide a security feature called the PUK (Personal ...