MadelineProtoDocs/old_docs/API_docs_v40/methods/auth.checkPhone.md

---
title: auth.checkPhone
description: Check if this phone number is registered on telegram
image: https://docs.madelineproto.xyz/favicons/android-chrome-256x256.png
redirect_from: /API_docs/methods/auth_checkPhone.html
---
# Method: auth.checkPhone  
[Back to methods index](index.md)


Check if this phone number is registered on telegram

### Parameters:

| Name     |    Type       | Description | Required |
|----------|---------------|-------------|----------|
|phone\_number|[string](../types/string.md) | The phone number to check | Yes|


### Return type: [auth.CheckedPhone](../types/auth.CheckedPhone.md)

### Can bots use this method: **YES**


### MadelineProto Example ([now async for huge speed and parallelism!](https://docs.madelineproto.xyz/docs/ASYNC.html)):


```php
if (!file_exists('madeline.php')) {
    copy('https://phar.madelineproto.xyz/madeline.php', 'madeline.php');
}
include 'madeline.php';

$MadelineProto = new \danog\MadelineProto\API('session.madeline');
$MadelineProto->start();

$auth.CheckedPhone = $MadelineProto->auth->checkPhone(['phone_number' => 'string', ]);
```

Or, if you're into Lua:

```lua
auth.CheckedPhone = auth.checkPhone({phone_number='string', })
```

### Errors

| Code | Type     | Description   |
|------|----------|---------------|
|400|PHONE_NUMBER_BANNED|The provided phone number is banned from telegram|
|400|PHONE_NUMBER_INVALID|The phone number is invalid|
|406|PHONE_NUMBER_INVALID|The phone number is invalid|
|401|AUTH_KEY_PERM_EMPTY|The temporary auth key must be binded to the permanent auth key to use these methods.|