To use SIM card video call, you should check the requirements below:
1) Video call requires network/SIM card support, please contact your SIM operator to make sure you have the video call service.
2) Make sure called party also support video call and his/her SIM operator is the same as yours
Video call option will appear during voice call is connecting when above requirements are met.
The services available in countries or regions are different, choose to access services.