Doctorsim is a legal method to unlock your invalid sim card in a matter of hours without going through the technical stuff behind the scenes to execute the technique. The following devices are already unlocked, including old devices: Network Locked Sim Card Inserted Ee Network Locked Sim Card Inserted Here Is How To Unlock It 8 to disable the sim card lock, tap. Network locked sim card inserted ee . 7 when the sim card lock is activated, you can tap change sim card pin to change to a new pin number. The default pin number is 1234. This means they won't work with another network's sim card. Then, turn on the device again and a prompt will ask you to input the unlock code. Fix ‘network locked sim card inserted’ via doctorsim. Here is how to confirm this. When you go to unlock your phone, all you need to do is insert a sim card from the carrier you want to switch to. Open your browser and type in ‘doctorsim.com‘ If it is locked due to either of these issues ...