If your SIM card is blocked, this is a different issue to it not working properly. If your SIM card is not working properly, check out our relevant post here. If your SIM card is blocked, often you have entered the wrong PIN code too many times. It usually takes three to five wrong entries for your SIM to lock itself. This can be frustrating, but this protects you from someone trying to access your phone and your personal information. It will also stop potential hackers making calls if your cell phone is lost or stolen.
You may see “PIN blocked” or “Enter PUK code” on your cell phone display. The PUK code stands for PIN Unblocking Key. In the U.S., the PUK code is rarely provided when you get your subscription. If you do not have your PUK code, contact the Customer Care service of your cell phone company, give them your phone number and once they are sure it is really you, they will give you the PUK code, which you need to enter into your phone; you will then be asked to set a new PIN code. Once you have your PUK then keep it in a safe place away from your mobile as it is the key to unblocking your SIM.
Note that if you enter a wrong PUK 10 times in a row, the SIM will be permanently blocked, and you’ll need to purchase a new SIM card.
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