The default PIN code for an AT&T SIM is 1111. The default PIN on the sim card is 1234 or 0000 or the last 4 digits of your phone number. What is the default PIN to unlock a SIM card? It is a specific type of sim lock removal for Samsung equipment purchased, especially found in Europe. That means you will need to purchase an unlock service that includes the Regional Unlock code or Region Control Key (RGCK) option that we can provide you with. If you bought an unlocked Samsung in Europe or the United Kingdom and when traveling abroad the "unlocked" cell phone still requests an unlock code, it means that the phone was only unlocked for a specific region (Europe). What if my phone is Region locked and requires the RGCK unlock code? If you already purchased a code previously for this device then we can provide it again for free. ENTER SIM NETWORK PUK." then you need to enter in your unlocking code again to unlock the device. If you get one of the following messages: "SIM NETWORK UNLOCK PIN", " ENTER NETWORK LOCK CONTROL KEY", or "SIM NETWORK PIN BLOCKED. If this is the case, restart your phone again and after dismissing this error message a new message should appear.
It has been seen to happen on Samsung Galaxy S6, Samsung Galaxy S7, Samsung Galaxy S9, Samsung Galaxy Note 5, and JIO models. If your phone was previously network unlocked and suddenly after an update or a restore you get the network locked sim card inserted error message it is a fault with the phone's firmware. Why am I am getting the network locked sim card inserted message?
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