1. Device Identification & Nomenclature The "Fast 5366" is rarely a generic model number. It is almost exclusively a Carrier-Branded Router (e.g., T-Mobile Fast 5366 , Telstra Fast 5366 , or Smart Bro Fast 5366 ). Under the hood, the hardware is typically a Huawei B535 series (LTE Cat7 or Cat12) or a similar LTE-A Pro modem.