> 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-pro-extension/mobile-number-validation-in-frontend.md).

# Mobile Number Validation in Frontend

**1. Address Book**

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

<figure><img src="/files/ubyjM11qkvnAoc0n9By9" alt=""><figcaption></figcaption></figure>

**2. Registration page**

Mobile number with country flag and validation is also added when the customer creates a new account.

<figure><img src="/files/AgLdpLewbfus4C9bf4oI" alt=""><figcaption></figcaption></figure>

**3. Checkout Page**

Mobile number validation is added at the time of checkout.

<figure><img src="/files/lewXnhDnhLXhAyUu5Qo5" alt=""><figcaption></figcaption></figure>