Notes--Apple 4s mobile phone call transfer how to set

Hello, call transfer simply enter the appropriate code on the dial-up interface, no additional settings are required
Unconditional transfer **21* Phone # and then press the dialing key to cancel the code: # #21 # * #21 # and press the dialing key again
No signal, shutdown transfer **62* phone # and then press the dialing key to cancel the code: # #62 # * #62 # and press the dialing key again
No answer transfer **61* phone number *10* ring Time # then press the dialing key to       cancel the code:  
In case of busy transfer **67# phone # and then press the dialing key to  cancel the code: # #67 # * #67 # and press the dialing key again

Which number would you like to transfer to, and what number will you enter in the "phone number"?

Notes--Apple 4s mobile phone call transfer how to set