Sim Network Unlock Pin and Master Unlock Code. Why am I am getting the network locked sim card inserted message? 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. It has been seen to happen on Samsung Galaxy S6, S7, S9, Note 5 and JIO models. If this is the case, restart your phone again and after dismissing this error message a new message should appear.
If you get one of the following messages: "SIM NETWORK UNLOCK PIN", " ENTER NETWORK LOCK CONTROL KEY", or "SIM NETWORK PIN BLOCKED. What if my phone is Region locked and requires the RGCK unlock code? If you bought an unlocked Samsung in Europe or the United Kingdom and when travelling abroad the "unlocked" cell phone still requests an unlock code, it means that the phone was only unlocked for a specific region (Europe).
What is the PIN to unlock SIM? The default PIN on the sim card is 1234 or 0000 or the last 4 digits of your phone number. A. 1.