T-Mobile Sonic 4G Mobile HotSpot makes it possible for T-Mobile customers to access the company's fastest 4G network using a tablet, portable music player, gaming console, PC, and eReader; among other devices. As an added convenience, the T-Mobile Sonic 4G Mobile HotSpot comes equipped with a microSD card slot for up to 32GB of expandable memory. Manage access to files for sharing photos, documents, videos, and more. The high-speed device features a convenient OLED display that indicates signal strength, number of devices connected, number of unread text messages, connectivity to the internet, battery level, and network connection type.