1. Prepare mobile phone and card sticker. SIM cards must be cut into small cards and then cut off with nail clippers before they can be put into the card stickers;

2. Insert the card into the phone and turn it on. After opening, a prompt will pop up. Click accept, wait for about 10 second, open the dial, press 1 12, and then press the call key to start the call112;

3. Press the dial key. If the end button appears, please press it immediately. You can't connect or replay, otherwise you need to restart and start all over again. Then enter the setting, start the flight mode, and then wait;

4. After about 10 seconds, a prompt box will pop up, prompting that the SIM card is not installed, and then close the flight mode after confirmation. Then turn the flight mode on and off here. This time, you don't have to wait, just turn it on and off. After turning off the flight mode this time, the mobile phone will automatically search for operators.

5. Search is successful, Unicom signal is full, and it is used normally.