Now you can download free WhatsApp for iOS for first year, as it was already announced by the company that WhatsApp Messenger will be having a new fee system for iOS users and now yearly fee pricing model for new iOS users has been implemented.
This was already expected and you can read below details for more.
We are updating our business model for new iPhone users going forward. As you know, we used to charge iPhone users a $.99 one time payment, while Android and other platforms had free service for the first year and paid $0.99 a year after that. From now on, we’ve simplified our business model so that all users on all platforms will enjoy their first year of WhatsApp service for free, and only pay $.99 per year after that. We feel that this model will allow us to become the communications service of the 21st century, and provide you the best way to stay in touch with your friends and family with no ads getting in the way. The good news for all current iPhone users is that WhatsApp will be free of charge for the rest of your life.
For the first year you can download WhatsApp Messenger from the App Store for free.