Vodafone announces free mobile upgrade now in 250 locations – O2 & Three customers benefit too

If you’re outside the minimum term of your contract then you won't need to pay a cancellation fee - and you might be able to find a cheaper deal elsewhere.

But don't just switch contracts because the price is cheaper than what you're currently paying.

Take a look at how many minutes and texts, as well as how much data you're using, to find out which deal is best for you.

For example, if you're a heavy internet user it's worth finding a deal that accommodates this so you don't end up spending extra on bundles or add-ons each month.

Also note that if you're still in your contract period, you might be charged an exit fee.

Ready to look elsewhere? Pay-as-you-go deals are better for people who don’t regularly use their phone, while monthly contracts usually work out cheaper for those who do.

It's worth using comparison websites, such as MoneySupermarket and uSwitch.com, to compare tariffs and phone prices.

Billmonitor also matches buyers to the best pay-monthly deal based on their previous three months of bills.

It only works if you’re a customer of EE, O2, Three, Vodafone or Tesco Mobile and you’ll need to log in with your online account details.

There's also MobilePhoneChecker, which has a bill monitoring feature that recommends a tariff based on your monthly usage.

If you’re happy with your provider then it might be worth using your research to haggle a better deal.