The CTR35 converts a 4G or 3G USB Data Modem into a secure 16-connection wireless network. It can also use traditional Cable/DSL Ethernet-based modems to create ~350-feet of WiFi. Or use existing WiFi to create a secure connection with an unsecure public hotspot. CradlePoint routers are built to work with the most popular 4G/3G USB Modems from wireless operators such as: AT&T, Bell Canada, Clearwire, Cricket, Rogers, Rover, Sprint, T-Mobile, Telus, US Cellular, Verizon Wireless (Alltel), & Virgin Mobile.