iPhone 7 and iPhone 7 Plus come in two capacities: 32GB and 128GB. The term “GB“ stands for gigabytes. The more gigabytes you have, the more content you can store on your iPhone, such as apps, games, photos, HD videos, music, and movies. If you have a large music or photo library or lots of apps, it’s a good idea to consider an iPhone with a larger capacity. If you rarely download apps or you don’t take many photos or videos, an iPhone with a smaller capacity may be better for you.