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A SIM Only mobile phone contract offers a low-cost option for people who want to continue using their current mobile phone handset, and get a monthly package of minutes, texts and data. The main advantages of SIM Only contracts are their affordable monthly cost as you're subsidizing the cost of a phone with your contract, and shorter contract lengths compared to traditional Pay Monthly contracts. read more
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If you are planning on moving from Pay Monthly or Pay as You Go to a SIM Only contract on the same network, your service provider should be able to transfer you to the SIM Only contract without you needing to replace your current SIM card. However, if you're moving to a new provider, you'll have to replace your phone's current SIM card.
The contract states how many calls and text messages you can make and send in a given month, as well as how much mobile data you have available to you, for internet access on your phone and mobile apps use. You'll typically be charged a flat fee for your SIM Only service once a month, with this fee only increasing if you go above your predefined usage quota. Keep in mind that most providers now increase the price of your monthly tariff mid-contract in line with inflation.
SIM Only contracts typically last between 1 month and 24 months, with the shorter contract options providing flexibility and the longer ones some better tariff deals.
Compared to the benefits, there are few downsides to getting a SIM Only contract. When you're assessing SIM Only deals, do keep in mind the following:
Keep in mind that, as with traditional mobile phone contracts, getting the cheapest SIM Only deals may require taking on a longer contract, as the longer you can commit to staying with a particular mobile phone company the more they'll be willing to offer you, and at a cheaper price.
If you think a SIM Only contract is for you, the first thing you'll need to do is to compare SIM Only deals and find the best available for your needs. Check everything: from the amount of minutes, text messages, and mobile data you'll receive, to what contract lengths are available to you, and at what price.
If the best SIM Only plan you can find comes from a different provider to the one you're currently with, you may need to have your phone unlocked. Most networks will unlock your phone for free or at a low cost. Here are the main networks' details:
If you want to keep your current phone number once you've moved to a SIM Only mobile phone contract, you'll have to port your number to a new network by getting in touch with your current phone company to request a PAC (Port Authorisation Code).
When you have your PAC, contact your new phone company and give them the code, making sure to do this in thirty days otherwise the code will expire. On the day that your old phone number is transferred to your new SIM you will lose your service for a short period of time while the new provider comes online. For this reason, it's a good idea to turn your phone off completely during this period while you wait for service to be resumed.
It's good to keep in mind that SIM cards come in different sizes, therefore before you sign up to a SIM Only contract, you'll want to make sure you get the right size SIM to fit your phone. There are three different sizes of SIM card:
Most modern phones use the Nano SIM standard, though a handful of budget phones might use the Standard or Micro SIM form. Most SIM providers issue a 'Multi-SIM' card, which can be easily adapted to fit any SIM card slot.
Every day, we search through thousands of tariffs and offers from UK online retailers to find the best SIM Only deals and contracts across a selection of price points and needs.
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