---
title: "How to use Phone Numbering-Plan Validation"
url: "https://lookvalid.com/help/products/phone.md"
canonical_url: "https://lookvalid.com/help/products/phone"
last_updated: "2026-10-22"
type: "how-to"
summary: "What Phone Numbering-Plan Validation takes in, which fields it returns and how credits are charged for each lookup."
related: ["https://lookvalid.com/help/products/country-code.md", "https://lookvalid.com/help/products/email-domain-check.md", "https://lookvalid.com/help/products/ip.md", "https://lookvalid.com/help/billing/plans-and-credits.md"]
---

# How to use Phone Numbering-Plan Validation

What Phone Numbering-Plan Validation takes in, which fields it returns and how credits are charged for each lookup.

## What it does

Checks a phone number against its country's numbering plan and returns E.164, national and international formats, the country and the number type the plan assigns (mobile, fixed line, toll free, VoIP and others). Uses open libphonenumber metadata only: it does not query carriers, so it cannot tell whether a number is active, ported or reachable.

## What you send

Send these fields in the JSON body of the request.

Request fields for Phone Numbering-Plan Validation

| Field | Type | Required | Limits |
| --- | --- | --- | --- |
| phone | string | Required | up to 64 characters |
| country | string | Optional | up to 8 characters |

## What you get back

The `data` object of a successful response carries these fields. Every response also lists its `sources`, the `credits_charged` and whether it was a `cache_hit`.

Each field is described in the [API reference](https://lookvalid.com/docs/api/phone.md).

Response fields for Phone Numbering-Plan Validation

| Field | Type |
| --- | --- |
| valid | boolean |
| possible | boolean |
| e164 | string |
| national_format | string |
| international_format | string |
| country_calling_code | string |
| country | string |
| number_type | "mobile" or "fixed_line" or "fixed_line_or_mobile" or "voip" or "toll_free" or "premium_rate" or "shared_cost" or "personal_number" or "pager" or "uan" or "unknown" |
| line_type_source | string |
| carrier | null |
| area_code | string |
| area_code_region | object or null |
| extension | string |
| notes | string |

## What it costs

1 credit per valid number.

What each outcome costs

| Case | Charge |
| --- | --- |
| Found | 1 credit |
| Nothing found | 0 credits |
| Repeat inside 7 days | 0 credits |
| Errors and invalid requests | 0 credits |

## Run it

You can try it without an account in the [free tool](https://lookvalid.com/tools.md). The free tools share a limit per visitor.

From code, send a POST request to `https://YOUR_API_HOST/v1/phone` with your API key.

A request to Phone Numbering-Plan Validation

```bash
curl -X POST https://YOUR_API_HOST/v1/phone \
  -H "Authorization: Bearer $LOOKVALID_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"phone":"+12025550143"}'
```

Full parameters and response fields are in the [API reference](https://lookvalid.com/docs/api/phone.md). To run a list of values, use a [bulk CSV job](https://lookvalid.com/help/api/bulk-csv-jobs.md).

## Good to know

- A repeat of the same lookup within 7 days is served from your cache and costs 0 credits.
- When the lookup finds nothing it returns `found: false` and costs 0 credits.
- Invalid input and errors are never charged.
- The API allows 200 requests per 10 seconds per key.

## Related

- [How to use Country Calling Codes](https://lookvalid.com/help/products/country-code.md)
- [How to use Email Domain Check](https://lookvalid.com/help/products/email-domain-check.md)
- [How to use IP Intelligence](https://lookvalid.com/help/products/ip.md)
- [Plans, credits and how they are spent](https://lookvalid.com/help/billing/plans-and-credits.md)