Three UK has announced plans to implement "4G" on their network, but instead of putting LTE on trial, for now the carrier is favouring DC-HSPA (the DC means dual-channel). In theory customers should be able to witness speeds up to 42Mbps, and with Three's "unlimited" data plans this will certainly excite smartphone owners.
Three currently operates a HSPA+ network that offers speeds of up to 21Mbps and is set to roll out DC-HSPA this coming summer. What's interesting to note is the timing of this announcement with the international Lumia 900 (supporting the "almost 4G" standard) being announced at MWC this week - coincidence?
Three still plans to introduce LTE through testing in the future so we'll happily take DC-HSPA for now.