In this tutorial, we will tell you how to fix this issue quickly. If the network unlock code has been inserted incorrectly for several times, the error message will pop up. You can ask your service provider to give you an unlock code or pay for one. To use the phone with a different network, you have to enter a proper SIM network unlock code. They lock down the phone so that people can only use it with their service for normally 2 years contact or longer.
Many people prefer to purchase smartphones from carriers, like AT&T, Verizon, T-Mobile, etc. When you see a message said SIM network PIN blocked on your smartphone screen, it means that you encounter the SIM network unlock PIN issue.
