The AT&T Calypso 4 is a prepaid smartphone with a single core processor, 6.1" HD+ screen, and 32GB storage capacity. It features a Vapor Gray color with a MicroSD memory card slot, 3GB RAM, and runs on Android operating system. The phone includes 3D Face Recognition feature, 5.0 MP camera resolution, and various connectivity options such as USB Type-C, Bluetooth, 4G, 3G, Wi-Fi, and LTE. With a sleek bar style design and Energy Star rating, this AT&T smartphone offers a reliable network connection for users looking for a budget-friendly device with essential features.