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Compare 12-month SIM only deals

Whether you need plenty of data, unlimited texts, or just want a flexible contract, 12-month SIM only plans have got you covered, offering both freedom and value.

In this article, we'll dive into the best 12-month SIM only deals, share some tips on how to pick the perfect one for you, and discuss the perks they bring to the table.

List of 12-month SIM-only deals


What is a 12-month SIM only deal?

A 12-month SIM only deal is a mobile phone plan option that provides you with a SIM card and a set amount of data, calls, and texts for a pre-determined period of typically one year (12 months).

Unlike phone contracts, you don't purchase a new handset along with the plan. This lets you use your existing phone with the new SIM card. You choose the data allowance that you want, as well as minutes and texts.

How does 12-month SIM only deal work?

These deals function like standard prepaid plans, but with a commitment period. You pay a fixed monthly fee instead of having to top up every single time, often at a lower rate than month-to-month options.

After your 12-month contract ends, the plan usually automatically renews at a new rate, or you can choose to switch to a new provider or plan. However, since you’ve signed the contract and want to cancel during the 12 months, you’ll most likely need to pay a cancellation fee, which is usually stated in terms of use.

Benefits of 12-month SIM only deal

12-month SIM-only contracts provide various benefits for mobile plans if you’re looking for fixed expenses and want to avoid handset upgrades. Here are some of the advantages:

  • Savings. Compared to pay-as-you-go plans, 12-month SIM deals often have cheaper total costs due to pre-negotiated rates for calls, texts, and data.
  • Predictable billing. With a set monthly cost, you can budget more easily because you know precisely what your phone bill will be each month.
  • No phone upgrade is required. These packages are designed for users who are satisfied with their current phone and want to avoid being tied to a contract for a new handset.
  • Potential network flexibility. While some 12-month deals may have automatic renewals, some offer the option to switch providers at the end of the contract term.

Best 12-month SIM only deals this week:

Which networks offer 12-month SIM only deals?

In the UK mobile market, many popular networks offer 12-month SIM only deals. This allows you to secure a year's worth of calls, texts, and data at a competitive price, all without the need to upgrade your phone. Let's overview the major players that offer these plans.


Vodafone is a leading network provider in the UK. It offers extensive coverage country-wide and reliable 4G and 5G speeds. Vodafone also has a variety of 12-month SIM only deals with varying data allowance, often including extras like entertainment subscriptions.

This provider also offers extras like free Amazon Prime for 12 months and multiple roam-free destinations.


Three offers quite a few SIM only packages – 30-day, 12 and 24-month contracts as well as pay-as-you-go across 5G SIMs, unlimited data SIMs, and more. In addition, Three is known for having strong 4G coverage across the UK.

One good thing that Three offers is the option to purchase more data when you run out.


O2 is the UK’s largest mobile network operator. It provides a well-rounded network experience with reliable coverage and a mix of 4G and 5G options. Their 12-month SIM only deals are for various budgets and data and call preferences, and most plans include benefits like priority customer service.

Plus, you can get exclusive O2 benefits when your household has Virgin Media broadband.

Tesco Mobile

Backed by the Tesco supermarket chain, Tesco Mobile offers several budget-friendly 12-month SIM only plans. Tesco Mobile uses O2's network for coverage, making it a good option if you want a reliable connection at an affordable price.

Tesco Mobile has no EU roaming fees until 2025, which is great if you travel abroad frequently.

Pros and cons of 12-month SIM only plans

What to consider when looking for 12-month SIM deal

With a variety of 12-month SIM only deals available, selecting the best option requires some consideration of what you need. Here's a breakdown of key factors to keep in mind:

  • Data usage. Do you browse occasionally, stream music regularly, or download large files? Choose a plan with a data allowance that comfortably accommodates your usage patterns.
  • Calls and texts. Consider how frequently you make calls and send texts. Unlimited plans might be ideal for heavy callers, while more limited allowances could be just enough for those who rely primarily on data or messaging apps.
  • Contract length. While the focus is on 12-month deals, be aware of potential variations. Some providers might offer slightly shorter or longer contract terms. Consider the commitment you're comfortable with and any potential flexibility for switching providers at the end of the contract.
  • Freebies. Some deals come with extra perks, such as free subscriptions to streaming services, entertainment bundles, or data rollover to the next month. Check these extras to see if they align with your interests and add value to the overall package.

How do I find a 12-month SIM plan?

Most major UK mobile network providers, including Vodafone, Three, O2, and more, offer 12-month SIM plans with different data, SMS, and call allowances.

You can check out the plans that a specific provider offers on their official website or if it’s your current provider – just give them a call or reach out online.

But before diving in, consider your phone habits. How much data do you use? Do calls and texts matter most? Once you know your needs, you'll be ready to snag a top deal that keeps you connected.

What happens at the end of a 12-month sim-only contract?

When your 12-month SIM only contract finishes, you have a few options. Typically, the plan will automatically renew. However, most providers allow you to:

  • Switch providers. Take this opportunity to explore deals from other networks and potentially find a better fit for your current needs.
  • Upgrade your plan. If your data usage has increased, some providers might offer the option to upgrade your existing plan within the same network.
  • Downgrade your plan. On the other hand, if your needs have changed and you use less data, you might be able to downgrade to a more affordable plan with the same provider.

Can I keep my number when I get a new SIM?

Yes, you can keep your existing phone number when you get a new SIM card when switching to a new 12-month SIM only deal (even if you're changing networks). This is called number porting and is free to request. Here's what you'll need:

  • Account number. Look for it on your current phone bill or by contacting your existing provider.
  • Porting Authorisation Code (PAC). This unique code is obtained from your current provider and allows the new network to transfer your number.

With this information, your new provider will take care of the transfer process for you. It can take a few days, and you'll be notified when your number is successfully ported to the new SIM.

Alternative SIM-only plans

Here are some alternative options to consider if a 12-month SIM only deal isn't the best fit for you:

  • Best SIM deals with unlimited data
  • Best pay-as-you-go SIM deals
  • Top SIM deals with 5G coverage