Line Type Override

Make a Line Type Override request to manually update the type for a specific phone number when the Line Type Intelligence response is incomplete or inaccurate. This ensures incorrect detection doesn't affect your workflows.

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Info

You can only update the type value under the line_type_intelligence data structure. The Line Type Override request doesn't support overrides for other fields or data types.

Override behavior

Overrides persist and apply to all future Lookup requests for the same phone number on your account.
Overrides apply only to the region where you created them. For example, an override created in the US1 region only applies to US1.

Base URL

https://lookups.twilio.com/v2/PhoneNumbers/{PhoneNumber}/Overrides/line_type_intelligence

Path parameter	Type	Description
`PhoneNumber`	string	The E.164-formatted phone number to override (for example, `+1419929960`)

Note: To ensure data privacy, Twilio doesn't support unencrypted HTTP.

Create an override

POST https://lookups.twilio.com/v2/PhoneNumbers/{PhoneNumber}/Overrides/line_type_intelligence

Request body parameters

1{
2  "line_type": "nonFixedVoip",
3  "reason": "Customer has provided evidence that this is a non-fixed VoIP number."
4}

Name	Type	Required	Description
`line_type`	string	Yes	The new `type` value for the provided phone number. This parameter accepts `mobile`, `landline`, `tollFree`, `fixedVoip`, `nonFixedVoip`, `personal`, `premium`, `voicemail`, `sharedCost`, `uan`, `pager`, and `unknown`.
`reason`	string	No	The reason for the override.

Response codes

Code	Description
`201`	Override successfully created
`422`	Unprocessable entity, such as unsupported field or value
`404`	Phone number not found
`409`	Override already exists with the same value
`500`	Internal server error

Code examples and response

Create an override

1// Download the helper library from https://www.twilio.com/docs/node/install
2const twilio = require("twilio"); // Or, for ESM: import twilio from "twilio";
3
4// Find your Account SID at twilio.com/console
5// Provision API Keys at twilio.com/console/runtime/api-keys
6// and set the environment variables. See http://twil.io/secure
7// For local testing, you can use your Account SID and Auth token
8const accountSid = process.env.TWILIO_ACCOUNT_SID;
9const apiKey = process.env.TWILIO_API_KEY;
10const apiSecret = process.env.TWILIO_API_SECRET;
11const client = twilio(apiKey, apiSecret, { accountSid: accountSid });
12
13async function createLookupPhoneNumberOverrides() {
14  const lookupOverride = await client.lookups.v2
15    .lookupOverrides("+14159929960", "line_type_intelligence")
16    .create();
17
18  console.log(lookupOverride.phoneNumber);
19}
20
21createLookupPhoneNumberOverrides();

1{
2  "original_line_type": "fixedVoip",
3  "overridden_line_type": "nonFixedVoip",
4  "override_reason": "Customer has provided evidence that this is a non-fixed VoIP number.",
5  "override_timestamp": "2025-05-29T20:11:43Z",
6  "phone_number": "+14159929960"
7}

Retrieve an override

GET https://lookups.twilio.com/v2/PhoneNumbers/{PhoneNumber}/Overrides/line_type_intelligence

Response code

Code	Description
`200`	Override successfully retrieved
`404`	Phone number not found
`500`	Internal server error

Code examples and response

Retrieve an override

1// Download the helper library from https://www.twilio.com/docs/node/install
2const twilio = require("twilio"); // Or, for ESM: import twilio from "twilio";
3
4// Find your Account SID at twilio.com/console
5// Provision API Keys at twilio.com/console/runtime/api-keys
6// and set the environment variables. See http://twil.io/secure
7// For local testing, you can use your Account SID and Auth token
8const accountSid = process.env.TWILIO_ACCOUNT_SID;
9const apiKey = process.env.TWILIO_API_KEY;
10const apiSecret = process.env.TWILIO_API_SECRET;
11const client = twilio(apiKey, apiSecret, { accountSid: accountSid });
12
13async function fetchLookupPhoneNumberOverrides() {
14  const lookupOverride = await client.lookups.v2
15    .lookupOverrides("+14159929960", "line_type_intelligence")
16    .fetch();
17
18  console.log(lookupOverride.phoneNumber);
19}
20
21fetchLookupPhoneNumberOverrides();

1{
2  "original_line_type": "fixedVoip",
3  "overridden_line_type": "nonFixedVoip",
4  "override_reason": "Customer has provided evidence that this is a non-fixed VoIP number.",
5  "override_timestamp": "2025-05-29T20:11:43Z",
6  "phone_number": "+14159929960"
7}

Update an override

PUT https://lookups.twilio.com/v2/PhoneNumbers/{PhoneNumber}/Overrides/line_type_intelligence

Request body parameters

1{
2  "line_type": "mobile",
3  "reason": "Customer has provided evidence that this is a mobile number."
4}

Name	Type	Required	Description
`line_type`	string	Yes	The new `type` value for the provided phone number. Supported values are `mobile`, `landline`, `tollFree`, `fixedVoip`, `nonFixedVoip`, `personal`, `premium`, `voicemail`, `sharedCost`, `uan`, `pager`, and `unknown`.
`reason`	string	No	The reason for the override.

Response codes

Code	Description
`200`	Override successfully updated
`404`	Phone number not found
`500`	Internal server error

Code examples and response

Update an override

1// Download the helper library from https://www.twilio.com/docs/node/install
2const twilio = require("twilio"); // Or, for ESM: import twilio from "twilio";
3
4// Find your Account SID at twilio.com/console
5// Provision API Keys at twilio.com/console/runtime/api-keys
6// and set the environment variables. See http://twil.io/secure
7// For local testing, you can use your Account SID and Auth token
8const accountSid = process.env.TWILIO_ACCOUNT_SID;
9const apiKey = process.env.TWILIO_API_KEY;
10const apiSecret = process.env.TWILIO_API_SECRET;
11const client = twilio(apiKey, apiSecret, { accountSid: accountSid });
12
13async function updateLookupPhoneNumberOverrides() {
14  const lookupOverride = await client.lookups.v2
15    .lookupOverrides("+14159929960", "line_type_intelligence")
16    .update({
17      line_type: "mobile",
18    });
19
20  console.log(lookupOverride.phoneNumber);
21}
22
23updateLookupPhoneNumberOverrides();

1{
2  "original_line_type": "fixedVoip",
3  "overridden_line_type": "mobile",
4  "override_reason": "",
5  "override_timestamp": "2025-07-04T20:30:00Z",
6  "phone_number": "+14159929960"
7}

Delete an override

DELETE https://lookups.twilio.com/v2/PhoneNumbers/{PhoneNumber}/Overrides/line_type_intelligence

Response code

Code	Description
`204`	Override removed
`404`	Override not found
`500`	Internal server error

Code examples

Delete an override

1// Download the helper library from https://www.twilio.com/docs/node/install
2const twilio = require("twilio"); // Or, for ESM: import twilio from "twilio";
3
4// Find your Account SID at twilio.com/console
5// Provision API Keys at twilio.com/console/runtime/api-keys
6// and set the environment variables. See http://twil.io/secure
7// For local testing, you can use your Account SID and Auth token
8const accountSid = process.env.TWILIO_ACCOUNT_SID;
9const apiKey = process.env.TWILIO_API_KEY;
10const apiSecret = process.env.TWILIO_API_SECRET;
11const client = twilio(apiKey, apiSecret, { accountSid: accountSid });
12
13async function deleteLookupPhoneNumberOverrides() {
14  await client.lookups.v2
15    .lookupOverrides("+14159929960", "line_type_intelligence")
16    .remove();
17}
18
19deleteLookupPhoneNumberOverrides();

Test an override

To test if an override has been applied to a phone number, make a Line Type Intelligence request.

Run Line Type Intelligence

1// Download the helper library from https://www.twilio.com/docs/node/install
2const twilio = require("twilio"); // Or, for ESM: import twilio from "twilio";
3
4// Find your Account SID at twilio.com/console
5// Provision API Keys at twilio.com/console/runtime/api-keys
6// and set the environment variables. See http://twil.io/secure
7// For local testing, you can use your Account SID and Auth token
8const accountSid = process.env.TWILIO_ACCOUNT_SID;
9const apiKey = process.env.TWILIO_API_KEY;
10const apiSecret = process.env.TWILIO_API_SECRET;
11const client = twilio(apiKey, apiSecret, { accountSid: accountSid });
12
13async function fetchPhoneNumber() {
14  const phoneNumber = await client.lookups.v2
15    .phoneNumbers("+14159929960")
16    .fetch({ fields: "line_type_intelligence" });
17
18  console.log(phoneNumber.lineTypeIntelligence);
19}
20
21fetchPhoneNumber();

1{
2  "calling_country_code": "1",
3  "country_code": "US",
4  "phone_number": "+14159929960",
5  "national_format": "(415) 992-9960",
6  "valid": true,
7  "validation_errors": null,
8  "caller_name": null,
9  "sim_swap": null,
10  "call_forwarding": null,
11  "line_status": null,
12  "line_type_intelligence": {
13    "error_code": null,
14    "mobile_country_code": "240",
15    "mobile_network_code": "38",
16    "carrier_name": "Twilio - SMS/MMS-SVR",
17    "type": "mobile"
18  },
19  "identity_match": null,
20  "reassigned_number": null,
21  "sms_pumping_risk": null,
22  "phone_number_quality_score": null,
23  "pre_fill": null,
24  "url": "https://lookups.twilio.com/v2/PhoneNumbers/+14159929960"
25}