Apple iPhone 6 (iOS8)

Press Settings.

Press Phone.

Press Call Forwarding.

Select one of the following options:

Turn on divert, go to 2a.

Turn off divert, go to 2b.

Press the indicator next to "Call Forwarding" until the function is turned on.

If it's the first time you divert calls:

Key in the required phone number and press Call Forwarding.

If you've diverted calls before and want to change the phone number:

Press Forward to.

Press the delete icon to clear the field.

Key in the required phone number and press Call Forwarding.

Press the indicator next to "Call Forwarding" until the function is turned off.

Press the Home key to return to the home screen.