4G offers super fast connectivity, with speeds on average up to five times faster than 3G. If you really, really want to make the most of your up-to-the-minute smartphone, you're going to need a 4G contract.
From seamless music streaming, video that's free of buffering, lightning-quick downloads and super-slick multi-tasking, 4G can handle it all.
But which 4G carrier is best? Which is fastest? And what extras or sweeteners are 4G networks offering? Here, we outline some of what you can expect for your monthly outlay to help you get the right 4G deal for you.
As the UK's first 4G carrier, EE had something of a head-start over rivals.
So it's perhaps to be expected that EE's network is the UK's most extensive, taking in 510 towns and cities or around 80% of the population. By the end of 2015, coverage is set to reach 98%.
EE's early start has also meant it has been able to improve the speed of its service and offer a premium, even-faster option in a host of UK cities.
These including Belfast, Birmingham, Bristol, Cardiff, Derby, Edinburgh, Glasgow, Leeds, Liverpool, London, Manchester, Newcastle, Nottingham, Sheffield, Southampton, Sunderland, Sutton Coldfield, Walsall, West Bromwich and Wolverhampton.
EE 4G contract and pay as you go prices are in line with other networks, with the cheapest contract deal coming in at under £20 per month.
One of the best things about EE, though, are the sweeteners.
Although the long-running two-for-one cinema and cheap pizza offer has now come to and end, customers still benefit from the chance to cut-price, 99p movie rentals to watch on their desktop, laptop or mobile device.
O2's 4G network now encompasses nearly 250 towns and cities and will cover 98% of the population by 2015.
Sweeteners with O2 are also impressive and take in Priority, which gives access to gig tickets at O2 venues a full 48 hours before they go on general release. Customers also benefit from some attractive offers from high-street retailers.
Three's 4G network isn't huge at the time of writing, but still takes in 50 cities. By the end of 2015, it's aiming to be able to offer a 4G service to 98% of the population.
Three customers who have 4G phones but who have until been on 3G qualify for 4G for no extra charge.
As of January 2015, Vodafone's 4G coverage encompasses 50% of the UK. As with its rivals, it is targeting 98% coverage by the end of 2015.
The cheapest Vodafone 4G contracts start at a shade under £20 per month.
4G customers on Vodafone's Red plans also get a choice of NowTV, Sky Sports Mobile TV or Spotify Premium included.
Is it worth upgrading to a 4G tariff?
This really depends on what you use your phone for. If you're a heavy downloader or stream a lot of content or like to do lots of web-dependent things with your phone simultaneously, 4G could be just what you've been waiting for. It also means that you probably won't mind paying a bit extra to get a super-fast service.
However, if you just use your smartphone for checking your mail and the odd bit of light surfing, 4G might not be right for you.
4G download allowances
Compared with 3G contracts, 4G deals that offer unlimited downloads are a relative rarity. That means you'll have to be a bit more careful with how you use your phone.
Naturally, 4G deals that do offer hefty allowances don't come cheap either, so it's worth weighing this up before you opt for a next-gen network.