How to Set Up Call Forwarding With Major U.S. Phone Carriers (2025 Guide)

Forward Calls to Ivy so you never miss a lead

If your phones ring, Ivy should answer. This guide shows how to forward calls from the most common U.S. carriers to your Ivy number. Pick your provider below and follow the steps. If you get stuck, email support@callivy.com and we will walk you through it.

Quick tip: after you set forwarding, call your business line from a different phone and make sure Ivy picks up.

What you need before you start

• Your Ivy destination number

• Your carrier portal or device handy

• Two minutes to test

Mobile carriers

AT&T Wireless

Forward all calls immediately

1. Open your Phone app, dial:

**21*<IvyNumber>

2. Tap Call. You should hear confirmation.
   Turn off:

#21

Conditional forwarding

• When busy: **67*<IvyNumber># Off: #67#

• When unanswered: **61*<IvyNumber># Off: #61#

• When unreachable: **62*<IvyNumber># Off: #62#

You can also use the Call Forwarding toggle in your phone settings.

Verizon Wireless

Forward all calls

1. Dial:

*72<IVYNUMBER

2. Call and wait for confirmation tones.
   Turn off: *73

Conditional forwarding (busy or no answer)

• Dial *71<IVYNUMBER>

• Turn off with *73

T-Mobile

Forward all calls

**21*1<IVYNUMBER

Conditional

• Busy: **67*1<IVYNUMBER>#

• No answer: **61*1<IVYNUMBER>#

• Unreachable: **62*1<IVYNUMBER>#
  Reset all conditional: ##004#

Tip: T-Mobile often expects the leading 1 before the 10-digit number.

U.S. Cellular(This will also work with pretty much all business phone providers)

• All calls on: *72<IVYNUMBER> Off: *73

• No answer: *71<IVYNUMBER> Off: *73

• Busy: *90<IVYNUMBER> Off: *91

• Unreachable: *92<IVYNUMBER> Off: *93

VoIP and cloud phone systems

RingCentral

1. App or web: Settings → Call Handling and Forwarding

2. Add Forward to other phone and enter your Ivy number

3. Choose Simultaneous ring or set a ring order and timeouts

4. Save and test

Recommended Ivy setup

• Ring your extension for 0 to 10 seconds

• Then forward to Ivy for missed calls and after hours

Vonage Business

1. User portal → Settings → Forward All Calls and enter Ivy

2. For conditional, use Follow Me (sequential) or SimulRing

3. Save and test

Tip: Enable “press 1 to accept” if your cell voicemail sometimes grabs forwarded calls.

8x8

1. 8x8 Work app → Settings → Call Forwarding

2. Configure:

   • Always → Ivy

   • When busy → Ivy

   • When no answer → Ivy with a ring delay

   • During outage → Ivy (covers internet down)

3. Save and test

Zoom Phone

1. Web portal → Phone → Settings → Call Handling

2. Add Phone Number → External → enter Ivy

3. Choose when to use it

   • Business hours always forward

   • When busy

   • When not answered after X seconds

4. Save and test both business and closed hours

Nextiva

1. NextOS → Users → Call Forwarding

2. Set Always, Busy, No Answer, or Unreachable to Ivy

3. Save. Dial codes also work:

   • Always on: *72<IVYNUMBER> Off: *73

   • Busy on: *90<IVYNUMBER> Off: *91

   • No answer on: *92<IVYNUMBER> Off: *93

Dialpad

1. Dialpad settings → Your Devices → Add a forwarding number

2. Enter Ivy and verify

3. Toggle it on. Optional: require “press 1 to accept”

4. Calls will ring your Dialpad apps and Ivy together

Grasshopper

1. Extensions → select your extension

2. Add forwarding numbers → add Ivy

3. Choose Simultaneous or In order and set timeouts

4. Save and test

Ooma Office

• Turn on with code: *72<IVYNUMBER>

• Turn off: *73

• Quick toggle: *74
  Or set in portal: Call Handling → Forward it immediately → Ivy. Multi-Ring can ring your desk phone and Ivy together.

Testing checklist

• Call your business number from another phone

• Let it ring long enough to trigger your rule

• Confirm Ivy answers and reads your greeting

• Check caller ID passes through correctly

• If your personal voicemail captured the call, enable “press 1 to accept” on the forwarding rule

Troubleshooting

• Calls still go to old voicemail
  Turn on “require key press” on the forwarded leg so a mobile voicemail cannot auto-answer.

• Too many rings before Ivy
  Reduce ring time on your primary device or lower the “no answer” timeout.

• Busy callers do not reach Ivy
  Enable the busy forwarding rule or use simultaneous ring.

• After-hours behavior is wrong
  Set separate business and closed hours rules. Point closed hours straight to Ivy.

FAQs

Does forwarding cost extra
Mobile carriers may charge standard airtime or long distance on forwarded legs. VoIP plans usually include it domestically. Check your plan.

Will caller ID show the original caller
Most systems can preserve caller ID. Some show the company number. Choose the option you prefer in your portal.

What if my office internet is down
Use “unreachable” or “during outage” forwarding to Ivy so calls still reach you.

Make Ivy your fail-safe

Once forwarding is in place, Ivy answers every time, books appointments, and routes urgent calls. If you want us to set this up for you, we can do it on a quick call and test live.

Need help? support@callivy.com .