1. Which smartphones are compatible with Google Cardboard?

iPhone 5, 5s, 5c, 6 (The iPhone 6 Plus model will work, but its size will require some minor modifications of the Google Cardboard.)
Google Nexus 4 and 5
Motorola Moto X
Samsung Galaxy S4 and S5
Samsung Galaxy Nexus
HTC One
Motorola Moto G