Peek and Pop on iPhones with 3D Touch allows users to look into an email or web link without completely opening it. This lets you glance at what’s inside, making it easy to decide whether or not the particular email needs to be read now or can wait until later. 3D Touch is currently available on iPhone 6s, 6s Plus, 7, and 7 Plus (sorry owners of older iPhone models). You can use this tip to quickly find out what an email is about without opening it. This feature allows you to preview the email, delete it, mark it unread, view multiple other options, or open the email. Here’s how to quickly preview an email on an iPhone with 3D Touch.