The Ultrafast-ready version of the Samsung Galaxy S III now available through Three is the LTE model, Pocket-lint has been told by a company spokesperson. It costs an extra £5 a month or £100 more on ThreePay, the network's pay-as-you-go plan, so we wondered what was different about the handset itself. Now we know.

Three's Ultrafast DC-HSDPA network has now been rolled out to cover 55 per cent of the UK population. The carrier is currently part of the bidding process for 4G spectrum in Ofcom's ongoing auction, but has decided to adopt Ultrafast as a stop gap to ensure its customers can access faster data speeds even before its prospective LTE services launch later in the year.

The Ultrafast network is capable of faster download and upload speeds and a more stable connection. Three claims that UK coverage will rise to 80 per cent next month, March. And that's in addition to the regions covered by 4G LTE services when the auction results become known.

What's good news for those who opt for the Ultrafast-ready SGS3 though, is that it will already be 4G capable when in compatible areas, so you won't have to upgrade yet again.

The Samsung Galaxy S III Ultrafast is available in marble white or pebble blue from £34 a month over 24 months, or £449.99 on ThreePay. It comes with 16GB of on-board storage and all the other gubbins normally associated with the extremely popular handset, including the stunning 4.8-inch HD Super AMOLED display, 1.4GHz quad-core processor and 8-megapixel camera.

Pocket-lint reviewed the Samsung Galaxy S III LTE (GT-I9305) at the end of last year.