# Phone Number Verification

Phone number verification helps ensure that real people — not bots or duplicate accounts — are signing up for your campaign. When enabled, ReferralHero sends a verification SMS with a 6-digit code that the subscriber must enter to confirm their phone number.

You can use phone verification as your primary method (if phone number is the unique identifier) or as a secondary method for added security.

{% hint style="warning" %}
Any SMS verification usage will incur a pay-as-you-go charge of $0.15 per successfully verified phone number, billed weekly.
{% endhint %}

### Activate SMS in Your Account

Before you can enable phone number verification, SMS must first be activated in your account. To get started:

1. Email <support@referralhero.com> to begin your SMS application
2. Complete the short application form (we’ll send it to you)
3. Once submitted, we’ll begin the verification and setup process, which typically takes 1–7 days
4. Once approved, SMS will be activated in your account and you’ll be able to use phone number verification in your campaign

### Verification Options

You can choose from the following:

1. Require SMS Confirmation: The subscriber will be considered verified only when they confirm their phone number via a 6-digit SMS code
2. Require Email and SMS Confirmation: The subscriber must confirm both their email and phone number to be verified
3. Disable Verification Method: No confirmation SMS will be sent. The subscriber will be added without verification

### Phone Number Verification Process

When phone number verification is enabled, ReferralHero will send a 6-digit code to the subscriber’s phone number. How it works:

1. The subscriber enters their phone number during signup
2. A confirmation SMS with a 6-digit code is sent
3. The subscriber enters the code on the signup verification page
4. Once verified, they are added to your campaign

The code is valid for 10 minutes. If not verified in time, the subscriber can request a new code.

{% hint style="warning" %}
**IMPORTANT:**

* **Phone numbers must be entered in international format (e.g., +16572206234)**
* If 1-click sign-up is enabled, your users who opt-in through 1-click sign-up will not be sent a confirmation SMS.
* When using the API, if "double\_optin" is disabled, your users will not be sent a confirmation SMS.
  {% endhint %}

<figure><img src="/files/PJd8cNQaaMBwOZPBYAxI" alt=""><figcaption></figcaption></figure>

### Require Repeated Verification for Untrusted Devices <a href="#require-repeated-verification-for-untrusted-devices" id="require-repeated-verification-for-untrusted-devices"></a>

Enable this option to require repeated verification during signup or login for devices that are not recognized. When activated, subscribers signing up or logging in from an untrusted device will need to verify their identity again. This feature enhances security by preventing unauthorized access from unknown devices.


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