How does a transfer reach your phone?
The AI keeps the caller on the line and dials the number you gave it, usually your cell. When you answer, it connects the two of you. On your screen, the call usually shows up from the receptionist's number or the caller's, depending on the provider, not as a contact you recognize.
That last detail causes most of the trouble. Your phone decides whether to ring, screen or silence a call based on whether it recognizes the number. A transfer from a number your phone does not know is treated like any other stranger.
Why do transferred calls go missing?
Because phones now filter strangers. On an iPhone, Screen Unknown Callers can be set to Ask Reason for Calling, which screens the call before the phone rings, or Silence, which silences it and sends it to voicemail2. Apple counts any number not saved in your contacts as unknown2. On a Pixel, automatic Call Screen can screen first-time callers, and Google says screened calls won't be forwarded if you use call forwarding3.
Your carrier can filter too: the FCC has let phone companies block suspected illegal calls1. And people ignore numbers they don't know. In a Pew survey, 80% of U.S. adults said they generally don't answer unknown numbers4. The fix for all of it is the same: save the number transfers come from as a contact, which both Apple and Google advise for numbers you want to reach you2.
| Setting | What it does to a transfer | What to do |
|---|---|---|
| iPhone: Screen Unknown Callers set to Silence | Silences it and sends it to voicemail | Save the transfer number as a contact |
| iPhone: Screen Unknown Callers set to Ask Reason for Calling | Screens it before your phone rings | Save the transfer number as a contact |
| Pixel: automatic Call Screen for first-time callers | Screens it instead of ringing | Save the transfer number as a contact |
| Pixel: Call Screen with call forwarding on | Screened calls are not forwarded | Turn off automatic screening if you forward calls |
| Carrier spam blocking | May block or label it as suspected spam | Ask your carrier how to allow the number |
What should happen when you don't pick up?
Write it down before it happens. A good fallback order is: try you, then try a second person, then text you the caller's name, number and reason, then take a full message and tell the caller honestly when to expect a call back. Never let a transfer fall into your personal voicemail, where a customer hears a greeting meant for friends.
Make sure the AI only promises what you will do. A business answers for what its bot tells customers5, so if the receptionist says "Someone will call you within 15 minutes", someone has to. If you can't commit to a time, have it say "as soon as we can" and mean it.
Should the AI tell you who is calling first?
For urgent calls, yes. In a warm transfer, the AI tells you who is calling and why before it connects you, so you pick up knowing what the call is about. In a cold transfer, it connects the caller straight away, which is faster but leaves you starting from zero. Ask your provider which it does, and whether you can choose per call type.
A transfer can also keep the AI's line open while you talk, so check how your plan bills it. Some providers bill until their line drops, not until you answer, so a transfer that rings for a minute costs a minute. Our guide to which calls use up an AI receptionist's minutes covers it.
How do you test the handoff?
Make three calls from a phone that is not in your contacts. First, trigger a transfer and answer it: check that it rang, what number showed, and what the AI told you. Second, trigger one and don't answer: listen to what the caller hears and check that the fallback ran.
Third, repeat the second test with your phone on silent or in a focus mode, the way it will be when you are with a customer. If any of the three ends with the caller hearing silence or your personal voicemail, fix the setting before you rely on transfers.