Compare Three Mobile SIM only deals

At Uswitch, we have a wide range of excellent SIM only deals on Three Mobile. You can sign up for as little as £5 a month and enjoy plenty of data, as well as unlimited calls and texts. 

Three Mobile offers a huge variety of keenly-priced SIM only deals, ranging from 3GB a month, all the way up to unlimited data. With any of these deals, you’ll be able to enjoy 5G speeds at no extra cost, provided your handset is 5G-compatible. So, if you’re ready to start shopping for a new Three Mobile SIM deal, scroll up to the top of this page and start comparing our best deals.

Three Mobile is an excellent network. It’s one of the four big networks in the UK and it has its own network that offers 99% 3G and 4G coverage.  Even better, Three’s award-winning 5G network has now been rolled out across 400 towns and cities across the UK and is continuing to grow all the time.

As a Three Mobile customer, you’ll get access to lots of great perks, including the Three+ loyalty app, which is full of excellent offers. You can enjoy 20% off Uber Eats and £3 Cineworld tickets, as well as exclusive pre-sale tickets for gigs and events.

Three Mobile also has a helpful customer support team. They’re available Monday-Friday, 8am-10pm and 9am-6pm at weekends.

Three customers on Pay Monthly plans can get in touch by calling 333, free from their mobile phone. Alternatively, you can call 0333 338 1001 from any other phone and will be charged at their standard rate.

Three Mobile is one of the four major mobile phone network providers in the UK, so it uses its own network. As such, it’s able to deliver 3G and 4G coverage across 98.9% of the UK population. And its growing 5G network is now available in over 400 towns and cities.

Yes, you can use your Three Mobile SIM when travelling. However, depending on where you’re going, you’ll probably have to pay extra for the privilege of doing so. Three is one of the many networks that have reintroduced EU roaming charges after Brexit, so you’ll be charged to use your Three SIM anywhere in the EU.

To find out more, check out our guide on Three international roaming charges.

When you’re nearing the end of your Three Mobile contract, Three will contact you to let you know when you’ll be able to switch to another deal. While you can continue on the same contract, it’s a good idea to shop around to see if there’s a better deal out there for you. Three Mobile will probably recommend a selection of deals. But since upgrade options direct from a network are usually on the pricier side, we’d recommend comparing SIM only deals to make sure you’re getting good value for money.

Yes, if you’re with a different provider, you’ll be able to transfer your number across to your new SIM only contract with Three Mobile. Once you’re ready to switch, all you need to do is text PAC to 65075 and you’ll receive a text with your PAC code. 

When you receive your Three SIM through the post, you’ll find instructions on how to give your PAC code to your new network. Three will then transfer your number across to your new phone.

If you want any additional information, check out our guide on how to switch mobile phone providers.