Compare O2 SIM-Only Contact Deals
Optimo Deals is focused on comparing the best SIM-Only deals available out there. You can comfortably compare a great variety of O2 SIM-Only contracts with their prices included to instantly find your perfect plan. Whether you are looking for unlimited data, a flexible pay-as-you-go option, or just the cheapest O2 SIM-Only deal, Optimo Deals puts at your disposal a complete tool for comparing your options and choosing the one that best suits your needs.
If you want to find out more about O2 SIM-Only deals, this site will give you brief, but poignant information on various O2 SIM-Only contracts ranging between pay-as-you-go and business deals. By going through O2 SIM-Only deals, you shall be able to decipher what the best offers are for you based on your usage and the amount of money that you are willing and able to part with every month whether you want to take out a short-term contract or a long-term one. Click below to see a comparison table featuring O2 SIM-Only contracts.
Editor's Top Pick SIM Card Only Deals

Vodafone SIM-Only
£20 Per Month
Unlimited Calls
Unlimited Texts

O2 SIM-Only
£10 Per Month
1,000 Minute Calls
Unlimited Texts

Three SIM-Only
£8 Per Month
Unlimited Calls
Unlimited Texts

Vodafone SIM-Only
£24 Per Month
Unlimited Calls
Unlimited Texts
Compare Best O2 SIM-Only Contracts
| Network | Plan Name | Contract Length | Data Allowance | UK Minutes | UK Texts | Monthly Price | |
|---|---|---|---|---|---|---|---|
| ULTIMATE Unlimited DATA | 12 Month Airtime Plan | Unlimited | Unlimited | Unlimited | £46.49 | |
| PLUS 30GB | 12 Month Airtime Plan | 30GB | Unlimited | Unlimited | £23.99 | |
| PLUS 150GB | 12 Month Airtime Plan | 150GB | Unlimited | Unlimited | £26.99 | |
| CLASSIC 50GB | 12 Month Airtime Plan | 50GB | Unlimited | Unlimited | £24.00 | |
| PLUS 12GB | 12 Month Airtime Plan | 12GB | Unlimited | Unlimited | £21.99 | |
| CLASSIC 20GB | 12 Month Airtime Plan | 20GB | Unlimited | Unlimited | £22.00 | |
| PLUS Unlimited DATA | 12 Month Airtime Plan | Unlimited | Unlimited | Unlimited | £34.99 | |
| CLASSIC 100GB | 12 Month Airtime Plan | 100GB | Unlimited | Unlimited | £25.00 | |
| CLASSIC Unlimited DATA | 12 Month Airtime Plan | Unlimited | Unlimited | Unlimited | £33.00 | |
| ULTIMATE 30GB | 12 Month Airtime Plan | 30GB | Unlimited | Unlimited | £35.49 | |
| ULTIMATE 150GB | 12 Month Airtime Plan | 150GB | Unlimited | Unlimited | £38.49 | |
| CLASSIC 6GB | 12 Month Airtime Plan | 6GB | Unlimited | Unlimited | £20.00 | |
| CLASSIC 1GB | 12 Month Airtime Plan | 1GB | Unlimited | Unlimited | £18.00 | |
| ULTIMATE Unlimited DATA (24 Month) | 24 Month Airtime Plan | Unlimited | Unlimited | Unlimited | £22.24 for 6 months, then £44.49 | |
| PLUS Unlimited DATA (24 Month) | 24 Month Airtime Plan | Unlimited | Unlimited | Unlimited | £32.99 | |
| PLUS 150GB (24 Month) | 24 Month Airtime Plan | 150GB | Unlimited | Unlimited | £11.99 for 6 months, then £23.99 | |
| PLUS 30GB (24 Month) | 24 Month Airtime Plan | 30GB | Unlimited | Unlimited | £10.49 for 3 months, then £20.99 | |
| CLASSIC 250GB (24 Month) | 24 Month Airtime Plan | 250GB | Unlimited | Unlimited | £13.00 for 6 months, then £26.00 | |
| PLUS 12GB (24 Month) | 24 Month Airtime Plan | 12GB | Unlimited | Unlimited | £17.99 | |
| ULTIMATE 30GB (24 Month) | 24 Month Airtime Plan | 30GB | Unlimited | Unlimited | £32.49 | |
| ULTIMATE 150GB (24 Month) | 24 Month Airtime Plan | 150GB | Unlimited | Unlimited | £35.49 | |
| CLASSIC Unlimited DATA (24 Month) | 24 Month Airtime Plan | Unlimited | Unlimited | Unlimited | £31.00 | |
| CLASSIC 100GB (24 Month) | 24 Month Airtime Plan | 100GB | Unlimited | Unlimited | £22.00 | |
| CLASSIC 20GB (24 Month) | 24 Month Airtime Plan | 20GB | Unlimited | Unlimited | £19.00 | |
| CLASSIC 6GB (24 Month) | 24 Month Airtime Plan | 6GB | Unlimited | Unlimited | £17.00 | |
| CLASSIC 3GB (24 Month) | 24 Month Airtime Plan | 3GB | Unlimited | Unlimited | £15.00 | |
| Unlimited DATA (30 Day) | 30 Day Airtime Plan | Unlimited | Unlimited | Unlimited | £36.00 | |
| CLASSIC 50GB (30 Day) | 30 Day Airtime Plan | 50GB | Unlimited | Unlimited | £30.00 | |
| CLASSIC 20GB (30 Day) | 30 Day Airtime Plan | 20GB | Unlimited | Unlimited | £26.00 | |
| CLASSIC 5GB (30 Day) | 30 Day Airtime Plan | 5GB | Unlimited | Unlimited | £23.00 | |
| CLASSIC 1GB (30 Day) | 30 Day Airtime Plan | 1GB | 1000 | Unlimited | £20.00 |
Choosing The Right O2 SIM-Only Deal
For individuals who require unlimited data, O2 offers several plans that cater to heavy data users. The ULTIMATE Unlimited DATA plan is ideal for those who need constant access to data without worrying about overages. With the 12-month plan priced at £46.49 per month, it is suited for people who prioritize flexibility and want a shorter commitment. However, if you’re looking for a more budget-friendly unlimited data option, the PLUS Unlimited DATA plan at £34.99 per month offers a great balance between unlimited usage and affordability. For those willing to commit to a longer-term contract, the ULTIMATE Unlimited DATA 24-Month plan starts at £22.24 for the first six months, making it a cost-effective choice for heavy data users over the long haul.
For those seeking the cheapest SIM-only deal, O2 offers several lower-data plans at affordable prices. The CLASSIC 1GB plan at £18.00 per month is perfect for light data users who mostly rely on Wi-Fi and need a simple plan for basic tasks like browsing and messaging. On the other hand, if you want a combination of a decent amount of data with a reasonable price, the PLUS 150GB plan at £26.99 per month or the CLASSIC 50GB plan at £24.00 per month are excellent options. These plans provide a generous amount of data at a competitive price, making them ideal for users who need significant data for streaming and browsing but still want to keep costs manageable.
O2 Mobile Network Coverage
O2 Mobile Network offers extensive coverage across the UK, providing reliable service in major cities as well as rural areas. In cities like London, Birmingham, Manchester, and Liverpool, O2 boasts near-complete 4G and 5G coverage, ensuring that users experience seamless connectivity for mobile data, voice calls, and texting. In these densely populated areas, O2 has invested heavily in network infrastructure, allowing users to enjoy fast data speeds, clear voice calls, and consistent texting capabilities. Whether you’re navigating the busy streets of London or catching a football match in Manchester, O2’s network provides dependable service to keep you connected.
Other cities, including Leeds, Bristol, Edinburgh, and Glasgow, also benefit from strong O2 network coverage. In these areas, O2 users can expect excellent 4G and rapidly expanding 5G coverage, particularly in central business districts and densely populated neighborhoods. This means that whether you’re working remotely from a café in Leeds or attending a festival in Edinburgh, you can rely on O2’s mobile data network to stream, browse, and stay connected with ease. Additionally, O2’s voice calling network in these cities is robust, delivering clear, uninterrupted calls, and reliable text messaging capabilities.
Even in slightly smaller cities like Sheffield and Newcastle, O2 provides excellent 4G coverage, with growing 5G networks. This ensures that users in these regions experience the same high level of service for mobile data, voice calling, and texting as those in larger cities. Whether you’re using data-heavy apps, making calls, or sending messages, O2’s coverage in these areas is designed to meet your needs. The network’s commitment to enhancing its infrastructure ensures that, in the near future, 5G will become even more widespread, offering faster data speeds and improved connectivity in cities and towns across the UK.
O2’s Mobile Data Speed
O2 offers both 4G and 5G mobile data services, making it a competitive choice for users who rely heavily on data for streaming, gaming, and other bandwidth-intensive activities. Its 4G network is widely available across the UK, delivering speeds that are more than adequate for browsing, streaming on platforms like Netflix and YouTube, and even online gaming. With average 4G download speeds of around 18-30 Mbps, O2’s network allows users to stream videos in HD without buffering and engage in real-time gaming without significant lag. However, with the introduction and expansion of 5G, O2 users in major cities can experience even faster data speeds, reaching over 100 Mbps, which is ideal for livestreaming, downloading large files, or playing more demanding online games.
In comparison to other mobile networks, O2’s 5G network, though still expanding, holds its own against competitors like EE and Vodafone, which have more established 5G infrastructures. O2’s speeds are generally fast enough for most users, though EE tends to lead in terms of overall 5G availability and peak speeds. Additionally, several other companies, such as Giffgaff and Tesco Mobile, operate on O2’s network, offering the same level of coverage and speed, but often at different price points. For users looking for reliable mobile data for streaming, gaming, or video calls, O2’s 4G and 5G networks provide a solid and dependable experience, suitable for most data-heavy activities.
Frequently Asked Questions About O2 SIM-Only Deals
If you’re considering an O2 SIM-Only deal, you may have some questions about the plans, benefits, and how they work. O2 SIM-Only deals offer flexibility and value for both light and heavy data users, but it’s important to understand all aspects of the service before making a decision. Below, we’ve compiled a list of frequently asked questions to help you better understand what O2 SIM-Only deals have to offer.
What is an O2 SIM-Only deal?
What is an O2 SIM-Only deal?
An O2 SIM-Only deal is a mobile plan where you pay for a SIM card that gives you access to O2’s network without the cost of a new phone. You choose a plan based on your desired data allowance, minutes, and texts. These deals are great for those who already own a phone and are looking for a more flexible or affordable alternative to traditional phone contracts. With O2 SIM-Only, you can select a contract length that suits your needs, ranging from 30-day rolling contracts to 12- or 24-month options.
What are the benefits of an O2 SIM-Only plan?
What are the benefits of an O2 SIM-Only plan?
O2 SIM-Only plans offer several key benefits. First, they tend to be more affordable than standard phone contracts because you’re not paying for a handset. They also provide greater flexibility—many plans offer shorter contract lengths, giving you the freedom to change or cancel without being tied to a long-term commitment. O2 also offers perks like access to Priority, which gives you early access to concert tickets, exclusive offers, and free experiences. Additionally, O2 SIM-Only plans come with access to O2’s reliable 4G and expanding 5G network for fast mobile data.
Can I keep my existing phone number?
Can I keep my existing phone number?
Yes, you can easily keep your existing phone number when switching to an O2 SIM-Only deal. All you need to do is request a PAC (Porting Authorisation Code) from your current provider and give it to O2 when setting up your new SIM card. The transfer process is quick and usually takes one working day, allowing you to seamlessly switch providers without changing your number.
Do O2 SIM-Only plans include 5G?
Do O2 SIM-Only plans include 5G?
Yes, many of O2’s SIM-Only plans include 5G, provided you have a 5G-compatible phone and are in an area with 5G coverage. 5G offers much faster data speeds compared to 4G, making it ideal for streaming high-definition videos, online gaming, and video calls. O2’s 5G network is constantly expanding, so more cities and towns are gaining access to this high-speed service over time.
What contract lengths are available with O2 SIM-Only?
What contract lengths are available with O2 SIM-Only?
O2 offers a range of contract lengths to suit different preferences. You can choose from 30-day rolling contracts, 12-month contracts, or 24-month contracts. A 30-day rolling contract gives you the most flexibility, allowing you to change or cancel your plan with short notice. Longer contracts, such as the 12- and 24-month options, often come with better value in terms of monthly pricing, making them suitable for those who are happy to commit for a longer period.
Are there pay-as-you-go SIM-Only options?
Are there pay-as-you-go SIM-Only options?
Yes, O2 offers pay-as-you-go (PAYG) SIM-Only options for customers who prefer not to commit to a monthly contract. With PAYG, you top up your SIM card with credit and pay only for the minutes, texts, and data you use. This is a great option for light users or those who want to control their spending without being tied to a recurring payment.
What data allowances are available with O2 SIM-Only deals?
What data allowances are available with O2 SIM-Only deals?
O2 offers a variety of data allowances to cater to different users. Whether you’re a light data user or someone who streams content regularly, O2 has a plan for you. Options range from small data packages like 1GB for light browsing to unlimited data plans for those who stream, game, and download on the go. Popular mid-range options include plans with 12GB, 50GB, or 150GB, offering a balance between data capacity and affordability.
Can I change my O2 SIM-Only plan?
Can I change my O2 SIM-Only plan?
Yes, O2 allows you to change your SIM-Only plan if your needs change over time. If you’re on a 30-day rolling contract, you can switch to a different plan or upgrade at any time. If you’re on a 12- or 24-month contract, you can still change your plan, though you may need to wait until your contract is closer to renewal or pay a fee to switch early.
Is there a credit check for O2 SIM-Only contracts?
Is there a credit check for O2 SIM-Only contracts?
Yes, O2 requires a credit check for most SIM-Only contracts, especially for 12- and 24-month plans. This is because you’re entering into a financial agreement where you commit to paying a set amount each month. However, pay-as-you-go SIM-Only deals typically do not require a credit check, making them a good option if you want to avoid this process.
Can I use my O2 SIM-Only plan abroad?
Can I use my O2 SIM-Only plan abroad?
Yes, O2 offers Roam Like at Home, which allows you to use your UK allowance of data, minutes, and texts in certain destinations across Europe at no extra cost. However, if you travel outside of these countries or use your phone for extended periods abroad, additional charges may apply. It’s always a good idea to check O2’s roaming policies before traveling to avoid unexpected fees.
Are O2 SIM-Only plans suitable for business use?
Are O2 SIM-Only plans suitable for business use?
Yes, O2 offers business SIM-Only deals that are designed for professionals and companies. These plans come with options for larger data allowances, priority customer service, and features like shared data plans for multiple users. Whether you need a SIM for individual business use or for a team, O2’s business SIM-Only plans offer flexibility and reliable coverage, making them a strong choice for keeping your business connected.
What happens if I go over my data allowance?
What happens if I go over my data allowance?
If you exceed your data allowance on an O2 SIM-Only plan, you will be charged for additional data usage, unless you’re on an unlimited data plan. O2 sends alerts when you’re nearing your data limit, helping you manage your usage. If you find yourself regularly exceeding your allowance, it may be worth upgrading to a plan with a larger data package to avoid extra charges.
Can I get discounts on O2 SIM-Only plans?
Can I get discounts on O2 SIM-Only plans?
Yes, O2 occasionally offers promotions and discounts on their SIM-Only plans. For example, they may provide reduced prices on long-term contracts or special deals for existing O2 customers. It’s a good idea to keep an eye on their website or check with their customer service team to see if any current offers apply to your chosen plan.






