Simply put, it usually works out a lot cheaper than paying for it on a traditional two-year contract.
You'll also get a much wider choice of network providers, as well as far more flexibility. If you sign up for a SIM-only deal, you can choose a 12-month contract or even a 1-month rolling contract. That means you can switch to another deal if you spot a cheaper contract. Or one that more closely matches the monthly allowances you require.
Even better, you'll be able to buy a new phone whenever you like. Because you’re not locked in to a long contract, you’re free to sell your SIM-free LG G6 and put the proceeds towards your next handset.
Tempted? Take a look at our best SIM-only deals.
The only reason not to pay for a brand-new LG G6 upfront is that it will probably mean parting with £649 in one go.
However, if you get a phone on a two-year contract, you can spread the cost of the phone over two years.
Think you'd prefer to get the LG G6 on a contract? Check out our best deals at our LG G6 comparison page.