2nd number for WhatsApp is an iPhone application developed by NGP DEVELOPMENT SERVICES LTD and falls under the category of Social & Communication with a subcategory of Social networking. It's a free app that lets you use a second WhatsApp account on your iPhone without the need for a second phone. The app requires an internet connection, and you need to scan a QR code on your phone to use WhatsApp Messenger.

One of the most significant features of the app is that it allows you to have a second WhatsApp account. Additionally, the app provides access to quotes, statuses, and avatar images that update every week. The app's interface is user-friendly, and it does not require any technical knowledge to operate. However, the app's functionality is limited to WhatsApp, and it does not support other messaging apps.

In conclusion, 2nd number for WhatsApp is an excellent app for people who use two WhatsApp accounts and do not want to carry two phones. It's a free app with a user-friendly interface and provides access to quotes, statuses, and avatar images that update every week. The app's terms of service and privacy policy are available on the developer's website.