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If the wrong PIN is entered three times in a row, your SIM is blocked. To unblock your SIM, you need to key in the PUK. Follow these instructions to unblock your SIM.
Turn on your router
Connect to your Wi-Fi hotspot
Click the network icon.
A connection to your Wi-Fi hotspot is established.
Connect to the router configuration page
Key in 192.168.0.1 in the address bar and press Enter.
Highlight the field next to Password and key in admin