> For the complete documentation index, see [llms.txt](https://docs.magecomp.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.magecomp.com/magento-2-whatsapp-order-notification-ultimate-extension/mobile-number-validation-in-frontend.md).

# Mobile Number Validation in Frontend

**1. Registration page**

Mobile number with the country flag and validation is added to the customer registration page.

<figure><img src="/files/rYRubq9oGEAHUwUYhkHd" alt=""><figcaption></figcaption></figure>

**2. Update WhatsApp Number**

Mobile number validation is also added when the customer creates a new account.

<figure><img src="/files/CNmRE3D6SWSkOuuljlat" alt=""><figcaption></figcaption></figure>

**3. Guest Checkout**

Mobile number validation for guest checkout

<figure><img src="/files/guFPu6eYtGBvzoQl3D7B" alt=""><figcaption></figcaption></figure>

**4. Address Book**

Mobile number with country flag and validation is added at the customer address book in the frontend.

<figure><img src="/files/DhRyuJcFPWDRuIKicAK6" alt=""><figcaption></figcaption></figure>

**5. Checkout Page**

Mobile number validation is added to the checkout page

<figure><img src="/files/RMRCr0KFpaIy27UBiuez" alt=""><figcaption></figcaption></figure>