> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.agentphone.ai/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.agentphone.ai/_mcp/server.

# Get Contact Capabilities

GET https://api.agentphone.ai/v1/contacts/capabilities

Check which messaging channels a phone number supports, without sending
a message.

Runs a live check (typically 1-2 seconds), so the result reflects the
number right now. Capabilities can still change by the time you send.
Requires at least one active iMessage-capable or RCS number on the
account; each flag is null when your account holds no line that could
act on it (rcs reachability is checked against YOUR agents, so it can
differ per account while an agent is pre-launch).

Reference: https://docs.agentphone.ai/api-reference/contacts/get-contact-capabilities-v-1-contacts-capabilities-get

## Authentication

- `Authorization` header (bearer token, required) — Bearer authentication of the form `Bearer <token>`, where token is your auth token.

## Request

### Query parameters

- `phone_number` (string, required) — Phone number to check (E.164 preferred; URL-encode + as %2B)

## Response

### 200

Successful Response

- `phoneNumber` (string, required)
- `capabilities` (ContactCapabilityFlags, required)
- `checkedAt` (datetime, required)

## Errors

### 422 Unprocessable Entity Error

Validation Error

- `detail` (list of ValidationError, optional)

## Types

### ContactCapabilityFlags

- `imessage` (boolean, optional, nullable)
- `sms` (boolean, optional, nullable)
- `rcs` (boolean, optional, nullable)

### ValidationError

- `loc` (list of ValidationErrorLocItems, required)
- `msg` (string, required)
- `type` (string, required)

### ValidationErrorLocItems

- string
- integer

## Examples

**Response**

```json
{
  "phoneNumber": "string",
  "capabilities": {
    "imessage": true,
    "sms": true,
    "rcs": true
  },
  "checkedAt": "2024-01-15T09:30:00Z"
}
```

**SDK Code**

```python
import requests

url = "https://api.agentphone.ai/v1/contacts/capabilities"

querystring = {"phone_number":"phone_number"}

headers = {"Authorization": "Bearer <token>"}

response = requests.get(url, headers=headers, params=querystring)

print(response.json())
```

```javascript
const url = 'https://api.agentphone.ai/v1/contacts/capabilities?phone_number=phone_number';
const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://api.agentphone.ai/v1/contacts/capabilities?phone_number=phone_number"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Authorization", "Bearer <token>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.agentphone.ai/v1/contacts/capabilities?phone_number=phone_number")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.get("https://api.agentphone.ai/v1/contacts/capabilities?phone_number=phone_number")
  .header("Authorization", "Bearer <token>")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'https://api.agentphone.ai/v1/contacts/capabilities?phone_number=phone_number', [
  'headers' => [
    'Authorization' => 'Bearer <token>',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.agentphone.ai/v1/contacts/capabilities?phone_number=phone_number");
var request = new RestRequest(Method.GET);
request.AddHeader("Authorization", "Bearer <token>");
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = ["Authorization": "Bearer <token>"]

let request = NSMutableURLRequest(url: NSURL(string: "https://api.agentphone.ai/v1/contacts/capabilities?phone_number=phone_number")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "GET"
request.allHTTPHeaderFields = headers

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```