Welcome to Nexmo Developer

We are improving our Documentation, API references, learning resources & tooling to help you more effectively use our services. We want to help you find everything you need to integrate Nexmo APIs into your code.

As we start this transition, we’d love to hear from you with thoughts & suggestions. If you’ve got something, positive or negative, to tell us, please tell us using the feedback tool at the bottom of each guide or file an issue on GitHub. - Nexmo

Number Insight Standard

You can use Nexmo's Number Insight Basic API to retrieve a user's landline or mobile number, including checking to see that it is registered to an operator. This can help you verify that a phone number is real and give you information on how to format the number.

Number Insight Standard API is a synchronous, easy-to-use RESTful web service. For any phone number you can:

  • Retrieve the international and local format.
  • Know the country where the number is registered.
  • Line type detection (mobile/landline/virtual number/premium/toll-free)
  • Detect mobile country code (MCC) and mobile network code (MNC)
  • Detect if number is ported
  • Identify caller name (USA only)
  • Check if phone number is reachable
curl "https://api.nexmo.com/ni/standard/json?api_key=API_KEY&api_secret=API_SECRET&number=447700900000"

The response from the API contains the following data:

    "status": 0,
    "status_message": "Success",
    "request_id": "e98e0dfb-c485-491b-8d2a-283f35e21d04",
    "international_format_number": "447700900000",
    "national_format_number": "07700 900000",
    "country_code": "GB",
    "country_code_iso3": "GBR",
    "country_name": "United Kingdom",
    "country_prefix": "44",
    "request_price": "0.00500000",
    "remaining_balance": "10.000000",
    "current_carrier": {
        "network_code": "23420",
        "name": "Hutchison 3G Ltd",
        "country": "GB",
        "network_type": "mobile"
    "original_carrier": {
        "network_code": "23410",
        "name": "Telefonica UK Limited",
        "country": "GB",
        "network_type": "mobile"
    "ported": "assumed_ported",
    "roaming": {"status": "unknown"}