In 2025, SIM-only deals have become the preferred choice for millions of mobile users across the UK. Whether you’re looking to save money, enjoy flexibility, or maximize your data usage, there’s no shortage of excellent plans to choose from. By opting for a SIM-only deal, you keep your current handset while accessing competitive rates and generous allowances for calls, texts, and mobile data.
With new updates arriving this May, it’s the perfect time to find a deal that suits your needs and budget without being tied into expensive phone contracts.
Top SIM-Only Deals Available This Month
Several networks have launched fresh offers that combine affordability with high-value features. Here are some of the best SIM-only deals you can grab right now:
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Talkmobile
Offering an unlimited data plan for just £16 per month on a rolling one-month contract. Ideal for heavy data users who do not want to be locked into a long-term agreement. -
O2
Providing 175GB of monthly data for £14 on a 12-month contract. Along with data, O2 offers perks like priority concert tickets and high street discounts. -
iD Mobile
Offering a 108GB plan for only £9 a month with a one-month rolling contract. This deal is especially attractive for users who want flexibility with no long-term commitment. -
Three
Providing 40GB of data for £7 a month on a 12-month deal. Three’s wide 5G coverage also makes this an excellent budget choice for those needing moderate data usage. -
Tesco Mobile
Offering 12GB of data for £7.50 per month on a 24-month contract. A key benefit includes EU roaming without extra charges until 2026, perfect for travelers.
Each of these deals comes with unlimited calls and texts, making them great for users who prioritize communication without worrying about hidden charges.
Why Choose a SIM-Only Plan?
Choosing a SIM-only deal comes with numerous benefits that are increasingly important in today’s fast-paced world:
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Significant Cost Savings
Without the need to pay off an expensive handset, your monthly mobile costs are considerably lower. -
Flexibility and Freedom
Many SIM-only plans are available on one-month rolling contracts, giving you the option to switch or upgrade whenever needed. -
Wide Range of Options
Whether you need a small 5GB plan or unlimited data for heavy streaming, there’s a SIM deal tailored for every kind of user. -
Environmentally Friendly Choice
Continuing to use your existing smartphone reduces electronic waste, making SIM-only deals a sustainable option for environmentally conscious consumers. -
Better Control Over Spending
SIM-only deals usually come without unexpected charges, helping you manage your monthly expenses more predictably.
These advantages make SIM-only plans the smart choice for tech-savvy, budget-conscious consumers in 2025.
Summary: Best SIM-Only Deals in May 2025
| Provider | Data Allowance | Monthly Cost | Contract Type | Special Benefits |
|---|---|---|---|---|
| Talkmobile | Unlimited | £16 | 1 month | Unlimited browsing flexibility |
| O2 | 175GB | £14 | 12 months | O2 Priority perks and discounts |
| iD Mobile | 108GB | £9 | 1 month | Affordable short-term flexibility |
| Three | 40GB | £7 | 12 months | Strong 5G coverage |
| Tesco Mobile | 12GB | £7.50 | 24 months | No EU roaming charges till 2026 |
FAQs
What is a SIM-only deal and why should I choose one?
A SIM-only deal provides you with minutes, texts, and data without including a new handset. It’s an affordable option for users who already own a smartphone and prefer lower monthly bills.
Can I keep my current number when switching to a SIM-only plan?
Yes, you can easily transfer your number by requesting a Porting Authorization Code (PAC) from your existing provider and giving it to your new network.
Do SIM-only deals come with 5G access?
Many providers now include 5G access with their SIM-only plans at no extra cost, as long as your smartphone supports 5G technology.
Are SIM-only contracts available without long-term commitments?
Absolutely. Many networks offer one-month rolling contracts, allowing you to change or cancel your plan with minimal notice.
Is international roaming included in SIM-only plans?
Some providers offer inclusive EU roaming or optional global roaming add-ons. Always check the specific plan details to ensure it meets your travel needs.
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Aanchal is a passionate writer with a keen interest in storytelling, content creation, and creative expression. She enjoys exploring diverse topics and crafting engaging narratives that captivate readers.