SIM only deals are excellent for cutting down your monthly outgoings because they're normally slightly cheaper than standard monthly contracts.
They're also great if you're happy with the phone you've already got. It means you can change the benefits of your network, or have more flexibility to change networks.
If you're waiting for a specific phone, but it's not on sale just yet, SIM only is brilliant. Because of the short contracts, you can end your contract and get the phone of your dreams whenever it launches.
A nano SIM is the smallest SIM card and is used in phones like iPhone 6s, 6 and 5s, Samsung Galaxy S6 and S6 edge, HTC One (M9) and the Microsoft Lumia 950.
This is the second smallest SIM, and is the most common one used in smartphones. iPhone 4s, Samsung Galaxy S5 and S4 all use this size.
Another very common SIM size that's used in lots of older smartphones and most feature phones like the Samsung Galaxy Ace, Nokia Asha phones and older BlackBerry phones.
This is the same as a standard SIM but gives older BlackBerry® devices access to BlackBerry services. This is not needed for new BlackBerry phones running BlackBerry 10 OS such as the BlackBerry® Q10 & BlackBerry® Passport.
A 30 day SIM only deal is very flexible, letting you cancel and start a new deal practically whenever you want. If there's a phone you're waiting for and it'll be on sale in only a few weeks, a short 30 day SIM only deal is ideal.
A 12 month contract is still more flexible than a two year contract, and offers better value than a 30 day contract. You get a bit more for your cash, helping you save money.
An upgrade deal means you buy a new deal on your current network to replace your old deal. Often you'll get a better deal by upgrading.
The fastest way to check if you can upgrade right now is with our Upgrade Checker. Just fill in your details and it'll let you know straight away whether you can upgrade today.
Whether you can actually upgrade or not depends on how long you've had your current deal. The length of time varies from network to network, and whether you're on pay as you go or pay monthly. Have a look at our upgrade help page to find out more.
Some tablets can connect to the internet in the same way as smartphones do using network reception. These are sometimes called connected tablets. We sell special SIM only deals that include a set amount of data each month. Slot these SIMs into your connected tablet and you can get online anywhere.
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