From the home screen of your iphone 6 click on the “app store” icon. once inside the app store, click on “search” bottom of the screen with a magnifying glass icon. click on the white box that appears at the top of the screen and type “whatsapp messenger”.. Download whatsapp for iphone is the way to start. whatsapp for iphone will solve many problems when being in contact with your family, your friends and if customers, especially if you have your own business going . the whole process to have the application on your smartphone is much easier than it may seem at first.. On your iphone, open the app store app, tap search in the bar at the bottom, type whatsapp in the search bar at the top, tap "get" beside whatsapp messenger in the search results..