Vivoy93 how to set up SMS calling?

You must apply for the SMS call forwarding function, and set the forwarding number as needed to use SMS calls.

SMS calling is a service of China Mobile. Call the other party, the other party's mobile phone will be turned off or the signal is not good. After setting SMS forwarding, the mobile phone will no longer receive peer-to-peer SMS from other mobile phone numbers, but directly forward it to the mobile phone with the call forwarding target number.