Your secretary's number is …. You dial a short code once from your own phone. Tap any code below to copy it, paste it into your phone's dial pad, and press call. You'll hear a tone or see a confirmation.
Your phone rings first. If you don't pick up, the secretary answers. Best for everyday use.
You're already on a call, or you decline the call. The second caller goes to the secretary instead of voicemail.
Your phone is off, in airplane mode or has no signal. Callers still reach the secretary.
Every call goes straight to the secretary and your phone doesn't ring. Use it when you're closed, on vacation or in a meeting.
The three recommended kinds together are called "conditional" forwarding. They replace your carrier voicemail: missed callers get your secretary instead. "All calls" overrides the other three while it is on.
Phone app → ⋮ menu → Settings → Calls (or Supplementary services) → Call forwarding. You'll see Always forward, When busy, When unanswered and When unreachable. Enter in the ones you want.
Settings → Apps → Phone → Call Forwarding turns on all calls only, and only on AT&T, T-Mobile and carriers on their networks. For unanswered, busy and unreachable, use the codes above. Verizon iPhones don't show this setting; use the Verizon codes.
If the secretary doesn't pick up: check the code was entered with your secretary's full number, turn forwarding off and on again, and make sure your cell number is saved in your dashboard under "Teach your secretary". If a code is rejected, your plan may not include that kind of forwarding; your carrier can add it, usually free.
Codes marked "from carrier" come from that carrier's own support pages. Others are the standard codes for that network and can vary by plan, so run the tests above after you set them.