How can Apple's mobile phone make call transfer or voice automatic reply (China Unicom, when the mobile phone does not use SIM card)

In the above case, you can put the 1 card in your mobile phone to set up call forwarding and forward all incoming calls to card 2. The setting method is as follows:

1. Select "Settings"-"Phone" in the Apple phone.

2. Select the "Call Forwarding" function;

3. Open the call transfer button, select "All Calls" as the type, and click "Transfer to".

4. Enter the card number and click Return. Transfer to will display the number and a call transfer sign will appear at the top of the screen. Indicates that the call transfer was successful. Please consult the customer service of the local operator for the charging standard of call forwarding.