# Synchronous Number Verification

To verify if the number is valid (active on any network), you can request a Home Location Register (HLR) lookup.

```http
HTTP GET: https://hlr.mobivatebulksms.com/?lookup={msisdn,msisdn,...}&username={your username}&password={your password}
```

On success, we will return **JSON**:

```json
{
  results: [
    {
      to: "4474*******",
      mccMnc: "23430",
      imsi: "23430",
      originalNetwork: {
        networkName: "T-Mobile UK (Everything Everywhere Limited)",
        networkPrefix: "74326",
        countryName: "United Kingdom",
        countryPrefix: "44"
      },
      ported: false,
      status: {
        groupId: 3,
        groupName: "DELIVERED",
        id: 5,
        name: "DELIVERED_TO_HANDSET",
        description: "Message delivered to handset"
      },
      error: {
        groupId: 0,
        groupName: "OK",
        id: 0,
        name: "NO_ERROR",
        description: "No Error",
        permanent: false
      }
    },
    { ... },
  ]
}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://wiki.mobivatebulksms.com/archived-integrations/synchronous-number-verification.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.