The mobile network previously announced that it was finalising plans to offer the technology in Britain, but will now offer faster 3G instead.
"Let's be absolutely clear - this isn't 4G as in Long Term Evolution, or LTE as it's also known. Instead it's the leading-edge version of 3G technology - HSPA+ but running on the 42Mbps technical standard, and offering customers twice the speed potential as the 21Mbps technical standard," read a statement from the carrier.
Three's 3G upgrade will be rolled out this summer, upping customers' connection speed to 42Mbps with the addition of HSPA+ technology. The carrier said that it still hopes to offer 4G in the future.
"As well as continuing the 42Mbps roll out, we'll also be running our own Long Term Evolution trial in the next few months to get ourselves prepared for this technology, when the spectrum needed to run it is made available," the firm added.
Counties including the US and South Korea already have super-fast 4G LTE networks in operation, with the UK lagging behind. The technology enables speeds of up to 120Mbps, and would pave the way for a host of compatible phones and tablets to launch in the territory.
T-Mobile and Orange's joint venture Everything Everywhere is planning to introduce 4G to Britain following a trial period with BT, though the venture is yet to receive approval from Ofcom.
> O2 launches London trial of 4G mobile network