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Currently VirginMobileUSA (VM) uses 3G(CDMA/EVDO Revision A) and 4G(WIMAX) for its network in the United States. VM is also using Sprint's 4G(LTE) network for phones, but has no Broadband2Go branded devices that use LTE.
VM Broadband2Go is advertised with average 3G(EVDO) downlink (download speeds from the internet to your machine) data speeds between 600 and 1400 Kbps. Uplink (upload speeds from your computer to the internet) data speeds on 3G(EVD) can reach speeds of 600 Kbps.
VM 4G(WIMAX) is being advertised as speeds of 3 - 6 mbps download. They have not listed uplink speeds on the 4G(WIMAX) network.
Like all wireless data plans speeds will vary based on the number of users connected to any individual access point (tower) and the amount of connectivity available to the access point(tower). Virgin mobile can also throttle speeds down to 256Kbps (uplink and downlink) once users reach a limit set by the plan they are on.
SprintNextel (Sprint) access points (also referred to as towers) are used for access, no roaming onto non Sprint access points is available.
Since the service uses Sprint 3G(CDMA EVDO Revision A) and the Sprint 4G(WIMAX) networks the frequency will be the same as other Sprint devices. The 3G(EVDO) devices are commonly referred to as a CDMA 1900mhz system. The 4G(WIMAX) devices are referred to as 802.16e mobile WiMax standard 2.5GHz (2.5Ghz WIMAX).
VM Broadband2Go (bb2g) service is routed differently than Sprint connection card products on the 3G(EVDO) side. Routing on the 4G(WIMAX) network is unknown at this time.
VM 3G(EVDO) bb2g services appear to be behind some sort of blind proxy and may not be able to host some services, like a web server, or a VNC server, for example. VM bb2g, like Sprint mobile broadband services, proxy all DNS requests to Sprint's DNS servers blindly. It is unclear if this is the case on the 4G(WIMAX) network.
VM 3G(EVDO) bb2g can be used to access most VPN's, however, some Cisco VPN configurations, but not all, do appear to have issues when trying to connect on the service.