Great Kids Starter Phone. The AT&T Calypso U318AA is a stylish and reliable smartphone that runs on the Android 10 operating system. With a storage capacity of 16GB, this device offers plenty of space for storing photos, videos, and apps. The Chameleon Blue color adds a touch of sophistication to the phone, while the USB Type-C connectivity ensures fast and efficient data transfer. Designed specifically for the AT&T network, this smartphone guarantees seamless connectivity and a seamless user experience. open box new.