What is dual-carrier or 42 Mbps service?
Dual-carrier HSPA+ is a 4G network enhancement that effectively doubles the theoretical peak speed of T-Mobile’s HSPA+ 21 Mbps network to 42 Mbps. The higher data speeds are made possible because T-Mobile is taking two 5-megahertz HSPA+ downlink carriers—each supporting theoretical speeds of 21 Mbps—and bonding them together. The resulting bandwidth allows T-Mobile to deliver even faster data transfer speeds on its advanced 4G network, where this service is available.
