Best SIM Only Deals in the UK (No Contract, 2026 Guide)
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SIM only deals let you use your existing phone while paying only for minutes, texts and data — without expensive handset contracts. They’re ideal if you’ve already bought a smartphone, want flexibility, or simply want better value.
This buyer’s guide compares some of the best SIM only options available in the UK in 2026, helping you choose the right plan based on usage, data needs and budget.
What Is a SIM Only Deal?
A SIM only plan provides mobile service without a handset. You insert the SIM into your existing phone and only pay for the mobile service itself.
Benefits of SIM only include:
- Lower monthly costs
- No long contracts
- Flexibility to change or cancel
- Use your existing unlocked phone
- Great for secondary or spare phones
Pay As You Go vs Monthly SIM Only
There are two main types of SIM only plans:
| Type | Best For | Benefits |
|---|---|---|
| Pay As You Go | Light or occasional users | No commitment, pay only when needed |
| Monthly Rolling | Regular users | Predictable cost, better data allowances |
Best SIM Only Deals to Buy Right Now
⭐ Best Flexible SIM – SMARTY SIM Card (No Contract)
The SMARTY SIM is a great choice for users who want maximum flexibility with no long-term commitments.
- No contract — cancel anytime
- Unlimited data options available
- Excellent UK coverage
- Ideal for everyday smartphone users
📞 Best Budget PAYG SIM – Three PAYG Voice SIM Pack
A simple and affordable option for light phone usage, perfect for backup phones or emergency use.
- Pay only for what you use
- Voice, text and basic data included
- Great for occasional callers
View Three PAYG Voice SIM Pack
📶 Best Mid-Range SIM – Three PAYG Voice SIM Pack (10GB Data)
Ideal for everyday users who want a solid data allowance without paying for unlimited plans.
- 10GB data plus voice and text
- 30-day validity
- Great balance of value and usage
View Three PAYG Voice SIM Pack – 10GB
🚀 Best High-Data SIM – Three PAYG Voice SIM Pack (60GB Data)
Perfect for heavy users who stream, hotspot and browse frequently.
- 60GB data allowance
- Voice and text included
- Great for power users and families
View Three PAYG Voice SIM Pack – 60GB
How to Choose the Right SIM Only Plan
Consider how much data you use each month, whether you need unlimited calls and texts, and how flexible you want your plan to be.
- Light users: PAYG SIMs
- Average users: 10–30GB plans
- Heavy users: 60GB+ or unlimited
Browse SIM Cards at eFones
At eFones, we offer a wide selection of SIM cards for phones, travel and broadband.
Browse All SIM Cards | Shop Smartphones
Frequently Asked Questions
Do SIM only deals work with any phone?
Yes — as long as your phone is unlocked and compatible with UK networks.
Can I keep my existing phone number?
Yes — you can usually transfer your number using a PAC code.
Is SIM only cheaper than contracts?
Yes — you’re not paying for a handset, so monthly costs are typically lower.
Can I cancel a SIM only plan anytime?
Most no-contract SIMs allow cancellation with minimal notice.
Can I use SIM only abroad?
Roaming availability depends on the network and plan.