Attention:
A. Use this feature not only your mobile phone to support this function, the same is your SIM card also need to support this function, if you do not know whether the SIM support we can ask your service provider.
B. The password for the call limit is set by the calling operator and is not available on our phone.
1. Click the "Mobile" icon in the image below to enter.
2. Then we find the "menu" below the phone and click on the "Call settings" menu as shown in the following figure.
3. Then we find a "other settings" click on it to enter will see there is a "call limit" we click on the comprehensive.
4. Go to the following image interface, we click on "Voice call" as shown in the picture.
5. Here we can choose a number of different types, such as I test "all calls" as an example.
6. Then we enter the password, and then click "OK" to open this function.
All right, that's it. We need to enter the code when we call.