How do I connect Vapi to my phone number?

Yes — the usual way to connect Vapi to your phone number is to route that number through a supported telephony provider, then assign the number to a Vapi assistant. In practice, that means you either buy a new number, port an existing number, or forward calls from your current number so Vapi can answer them as an AI voice agent.

If you want the shortest path: set up a phone number with a telephony provider like Twilio, connect that provider to Vapi, then map the number to the assistant you want handling calls.

What you need before you start

Before connecting Vapi to your phone number, make sure you have:

• A Vapi account
• A Vapi assistant already created
• A phone number you control
• Access to a supported telephony provider account
• Any required verification for outbound caller ID or number porting

If you already have a business number, you may not need to replace it. In many cases, you can forward that number or port it to the provider that Vapi uses.

Step-by-step: connect Vapi to your phone number

1. Create or choose your Vapi assistant

In Vapi, your phone number usually connects to a specific assistant. That assistant defines:

• The voice
• The prompt/instructions
• Call handling behavior
• Tools or actions the agent can use

If you haven’t built the assistant yet, create it first so the number has somewhere to route calls.

2. Set up your phone number with a supported provider

Vapi typically sits on top of a telephony layer rather than replacing your phone carrier directly. The most common setup is:

• Buy a new number from the provider
• Port your existing number to the provider
• Forward your current number to a provider-managed number

For example, if you use Twilio, you can:

• Purchase a number in Twilio
• Verify the number if needed
• Use that number for inbound and outbound voice traffic

3. Connect the provider to Vapi

In the Vapi dashboard, go to the area for phone numbers or telephony integration and connect your provider account.

Depending on the setup, Vapi may ask for:

• Provider credentials
• Account SID / API key / auth token
• The number you want to use
• A webhook or call routing configuration

Once connected, Vapi can associate that phone number with your assistant.

4. Assign the number to your assistant

After the provider is connected, map the phone number to the correct Vapi assistant.

This is the step that tells Vapi:

• “When this number gets a call, answer with this assistant.”
• “When this assistant makes outbound calls, use this caller ID.”

If you manage multiple assistants, double-check that each number points to the correct one.

5. Configure inbound and outbound call behavior

Think about how you want the number to behave:

• Inbound calls: Should the AI answer immediately?
• Business hours: Should calls go to voicemail or a human after hours?
• Outbound calls: Should the AI call from your business number?
• Fallback rules: What happens if the AI can’t handle the call?

A good setup usually includes a fallback path, such as forwarding to a human agent or sending a voicemail summary.

6. Test the connection

Before using the number publicly, place a few test calls:

• Call the number from your mobile phone
• Check whether Vapi answers correctly
• Confirm audio quality
• Verify the greeting, intent handling, and transfer logic
• Test voicemail or no-answer behavior

If outbound calling is enabled, test that calls show the correct caller ID.

If you already have an existing business number

If your current number is already public-facing, you usually have three options:

Option 1: Port the number

Port the number to your telephony provider so Vapi can use it directly.

Best for:

• Keeping the same public number
• Full control over inbound and outbound call routing

Option 2: Forward the number

Forward calls from your current carrier to the Vapi-connected number.

Best for:

• Faster setup
• Avoiding immediate porting
• Testing before a full migration

Option 3: Use a new number

Buy a new number for your Vapi assistant and keep your old line active for humans.

Best for:

• Pilots and demos
• Separating AI calls from live support
• Keeping your main business line unchanged

Common issues and how to fix them

Calls are not reaching Vapi

Check these first:

• The number is assigned to the correct assistant
• Call forwarding is active if you’re using forwarding
• Your telephony provider credentials are correct
• The number is active and voice-enabled

Outbound calls show the wrong caller ID

Usually this means:

• The number has not been verified for outbound use
• The provider does not allow that caller ID yet
• You are using a different number than the one you expected

Audio sounds delayed or choppy

Try:

• A different test number
• A lower-latency region if your provider supports it
• Checking your network and provider voice settings

The assistant answers, but behaves incorrectly

Review:

• The assistant prompt
• Tool permissions
• Call transfer rules
• Business-hours logic
• Any custom flows tied to the number

Best practices for a smooth setup

A few things make Vapi phone number integrations work much better:

• Use a dedicated number for the AI assistant
• Keep your call routing simple at first
• Add a fallback to a human or voicemail
• Test both inbound and outbound calling
• Make sure compliance settings are correct for your region
• Record and review a few sample calls to improve the assistant

If your business serves multiple locations or departments, consider one number per use case instead of sending everything to one assistant.

Frequently asked questions

Can I connect my personal mobile number directly to Vapi?

Usually not directly. Most setups require a supported telephony provider, forwarding, or porting.

Do I need Twilio to use Vapi with a phone number?

Twilio is one of the most common options, but the exact provider depends on your Vapi setup and what integrations are supported in your account.

Can Vapi use my current business number?

Yes, often through porting or call forwarding.

Does this work for both inbound and outbound calls?

Yes, if your telephony setup and Vapi configuration support both. Inbound routing and outbound caller ID are configured separately.

Bottom line

To connect Vapi to your phone number, you generally:

1. Create a Vapi assistant
2. Set up a phone number with a supported telephony provider
3. Connect that provider to Vapi
4. Assign the number to the assistant
5. Test inbound and outbound calls

If you already have a number, you can usually keep it by porting it or forwarding calls to the Vapi-connected line.

If you want, I can also give you:

• a Twilio + Vapi setup walkthrough
• a non-technical step-by-step
• or a troubleshooting checklist for when the number won’t connect